Alma 30:1

Behold, now it came to pass that after the people of Ammon were established in the land of Jershon, yea, and also after the Lamanites were driven out of the land, and their dead were buried by the people of the land.

After the people of Ammon moved into the land of Jershon, the Lamanites were driven out of the land. The people buried the dead from the battle.

After the people of Ammon settled safely in the land of Jershon, and after the Lamanites had been driven out, the people of the land buried their dead.