Omni 1:21 - 1:25

Omni 1:21 And they gave an account of one Coriantumr, and the slain of his people. And Coriantumr was discovered by the people of Zarahemla; and he dwelt with them for the space of nine moons.

The engravings on the stone were about a person named Coriantumr who was the last of a people that once inhabited a region close by. Coriantumr was discovered by the people of Zarahemla and he live for about nine months before he died.
[The stone must have been more like a tablet in which Coriantumr being the last survivor of his people tried to leave some kind of record of their history and destruction. Twenty four plates are later discovered by the Nephites which give a detailed account of these people, but I guess Coriantumr did not know about them.]

Omni 1:22 It also spake a few words concerning his fathers. And his first parents came out from the tower, at the time the Lord confounded the language of the people; and the severity of the Lord fell upon them according to his judgments, which are just; and their bones lay scattered in the land northward.

This Coriantumr recorded what he could on this tablet a little of his people’s history that they originated from the Tower of Babel and had come to the land of promise. He relates the judgments that were upon the people because of their wickedness which lead to their complete destruction. Coriantumr pronounces the Lord destruction upon the his people as just what they deserved and that their remains are still laying on the ground even now.
[Must have been a dry region because if in the jungle, the bones would have disappeared rather quickly.]

Omni 1:23 Behold, I, Amaleki, was born in the days of Mosiah; and I have lived to see his death; and Benjamin, his son, reigneth in his stead.

Amaleki was born during the days of Mosiah and live to see his death and also see his son replace him.

Omni 1:24 And behold, I have seen, in the days of king Benjamin, a serious war and much bloodshed between the Nephites and the Lamanites. But behold, the Nephites did obtain much advantage over them; yea, insomuch that king Benjamin did drive them out of the land of Zarahemla.

Amaleki sees during his life time much war between Nephites which now consist of Mosiah’s people and the people of Zarahemla and the Lamanites. King Benjamin was an able military commander and by various strategies was able to drive them completely out of the land of Zarahemla.
[Since Mosiah had left the land of Nephi to get himself and his people far away from the Lamanites, the Lamanites must have went looking for them and found Zarahemla themselves and continued their warfare with both the Mosiah’s people and the people of Zarahemla.]

Omni 1:25 And it came to pass that I began to be old; and, having no seed, and knowing king Benjamin to be a just man before the Lord, wherefore, I shall deliver up these plates unto him, exhorting all men to come unto God, the Holy One of Israel, and believe in prophesying, and in revelations, and in the ministering of angels, and in the gift of speaking with tongues, and in the gift of interpreting languages, and in all things which are good; for there is nothing which is good save it comes from the Lord: and that which is evil cometh from the devil.

Amaleki is now an old man with no children, or at least none that were alive, to give the records of the Nephites too. However, he see the goodness in King Benjamin and gives the plates to him to continue keeping up the records of the Nephites. Amaleki exhorts us to come to Christ. To believe in prophecy, revelations, speaking in tongues, interpreting of tongues and all the good things from God. Amaleki advises us to fast and pray for these gifts and the strength to live the gospel until we are safely dead.
[Because of Amaleki’s experience with King Mosiah’s reading the engravings on the tablet and the amazement that the story must have brought to the people of Zarahemla, he was impressed with that to mention it in his last words. These two gifts to me are minor in their usefulness. I would have only talked about staying close in Christ until our earth test was over. But since these gifts were mentioned they must be important.]