Zeniff gave his kingdom to his son, Noah.
2 For behold, he did not keep the commandments of God, but he did walk after the desires of his own heart. And he had many wives and concubines. And he did cause his people to commit sin, and do that which was abominable in the sight of the Lord. Yea, and they did commit whoredoms and all manner of wickedness.
King Noah didn't obey the commandments, had many wives  and concubines, and made his people commit whoredoms.
3 And he laid a tax of one fifth part of all they possessed, a fifth part of their gold and of their silver, and a fifth part of their ziff, and of their copper, and of their brass and their iron; and a fifth part of their fatlings; and also a fifth part of all their grain.
6 Yea, and thus they were supported in their laziness, and in their idolatry, and in their whoredoms, by the taxes which king Noah had put upon his people; thus did the people labor exceedingly to support iniquity.
8 And it came to pass that king Noah built many elegant and spacious buildings; and he ornamented them with fine work of wood, and of all manner of precious things, of gold, and of silver, and of iron, and of brass, and of ziff, and of copper;
11 And the seats which were set apart for the high priests, which were above all the other seats, he did ornament with pure gold; and he caused a breastwork to be built before them, that they might rest their bodies and their arms upon while they should speak lying and vain words to his people.
12 And it came to pass that he built a tower near the temple; yea, a very high tower, even so high that he could stand upon the top thereof and overlook the land of Shilom, and also the land of Shemlon, which was possessed by the Lamanites; and he could even look over all the land round about.
13 And it came to pass that he caused many buildings to be built in the land Shilom; and he caused a great tower to be built on the hill north of the land Shilom, which had been a resort for the children of Nephi at the time they fled out of the land; and thus he did do with the riches which he obtained by the taxation of his people.
With the tax money, he built many elegant and spacious buildings, including a palace, throne, and high tower. 
He was a win-bibber,  who spent all of his time in riotous living with his wives and concubines, and his priests spent their time with harlots.
Then the Lamanites began to kill Nephites while they were in the fields tending their crops and animals.
17 And king Noah sent guards round about the land to keep them off; but he did not send a sufficient number, and the Lamanites came upon them and killed them, and drove many of their flocks out of the land; thus the Lamanites began to destroy them, and to exercise their hatred upon them.
Noah sent guards to protect the people, but he didn't send enough, and the Lamanites killed them too.
Finally, he sent his armies, who defeated the Lamanites.
19 And now, because of this great victory they were lifted up in the pride of their hearts; they did boast in their own strength, saying that their fifty could stand against thousands of the Lamanites; and thus they did boast, and did delight in blood, and the shedding of the blood of their brethren, and this because of the wickedness of their king and priests.
But then the Nephites began to boast and delight in blood, saying that that fifty of them could kill thousands of Lamanites.
20 And it came to pass that there was a man among them whose name was Abinadi; and he went forth among them, and began to prophesy, saying: Behold, thus saith the Lord, and thus hath he commanded me, saying, Go forth, and say unto this people, thus saith the Lord -- Wo be unto this people, for I have seen their abominations, and their wickedness, and their whoredoms; and except they repent I will visit them in mine anger.
21 And except they repent and turn to the Lord their God, behold, I will deliver them into the hands of their enemies; yea, and they shall be brought into bondage; and they shall be afflicted by the hand of their enemies.
A man named Abinadi began to prophesy, saying,
This is what God says:
Woe to the Nephites. I've seen their wickedness and whoredoms.
If they don't repent with sackcloth and ashes, I'll let their enemies kill and enslave them.
25 And except they repent in sackcloth and ashes, and cry mightily to the Lord their God, I will not hear their prayers, neither will I deliver them out of their afflictions; and thus saith the Lord, and thus hath he commanded me.
Then they'll know that I'm a jealous God.
After Abinadi was done with his prophesying, the people were angry with him.
They tried to kill him, but God didn't let them.
27 Now when king Noah had heard of the words which Abinadi had spoken unto the people, he was also wroth; and he said: Who is Abinadi, that I and my people should be judged of him, or who is the Lord, that shall bring upon my people such great affliction?
When King Noah found out about it, he said,
Who is Abinadi?
And why is God trying to hurt us?
28 I command you to bring Abinadi hither, that I may slay him, for he has said these things that he might stir up my people to anger one with another, and to raise contentions among my people; therefore I will slay him.
29 Now the eyes of the people were blinded; therefore they hardened their hearts against the words of Abinadi, and they sought from that time forward to take him. And king Noah hardened his heart against the word of the Lord, and he did not repent of his evil doings.
Bring Abinadi to me so I can kill him.