Jarom 1:11 - 1:15

Jarom 1:11 Wherefore, the prophets, and the priests, and the teachers, did labor diligently, exhorting with all long-suffering the people to diligence; teaching the law of Moses, and the intent for which it was given; persuading them to look forward unto the Messiah, and believe in him to come as though he already was. And after this manner did they teach them.

In order to keep the pressure up on the people to be faithful, the prophets and teachers were working overtime to keep reminding them of what would happen to them if they did not live as the should. They were to live the law of Moses but with the intent of using it to look forward to the Messiah. In addition they were to look forward to the Messiah like He had already made His appearance. In other words, keep the statues and ceremonies of the law of Moses, but live the gospel as Jesus would inaugurate when he came.
[They were living as if the Savior had already been crucified and died. They were to use the atonement to sacrifice their sins and live according to the order of the gospel even though they were sacrificing lambs at Passover. The prophets understood the real purpose of the law of Moses and had the correct knowledge of what the law was trying to instill in the people, while the Jews did not. The Jews thought it to simple and wanted it to be more involved, so the Lord gave them false insights which resulted in a intricate and complicated set of regulations and practices which required a lot of education to learn which in turned caused them who had this knowledge to feel themselves superior to all other peoples around them.]

Jarom 1:12 And it came to pass that by so doing they kept them from being destroyed upon the face of the land; for they did prick their hearts with the word, continually stirring them up unto repentance.

The Nephites were thus preserved by the continuous preaching which caused them to stay close to the Lord and be preserved by Him.
[They were only going to be preserved by the Lord. There was nothing they could do or knowledge they may have had that would keep them from being destroyed by the Lamanites if they turned to wickedness.]

Jarom 1:13 And it came to pass that two hundred and thirty and eight years had passed away—after the manner of wars, and contentions, and dissensions, for the space of much of the time.

It is now 238 years since Lehi left Jerusalem and it has been a life of almost continuous defensive warfare with the Lamanites.
[All battles were fought on Nephite soil. It appears that the Nephites did not go against the Lamanites on their territory.]

Jarom 1:14 And I, Jarom, do not write more, for the plates are small. But behold, my brethren, ye can go to the other plates of Nephi; for behold, upon them the records of our wars are engraven, according to the writings of the kings, or those which they caused to be written.

Jarom ends his record because there is little room left on the plates. A more complete history is on the other plates which are dedicated to the history of the Nephites.

Jarom 1:15 And I deliver these plates into the hands of my son Omni, that they may be kept according to the commandments of my fathers.

Jarom now passes down the plates to his son Omni and he is commanded to keep the records as he was commanded by his father Jacob.