Alma 30:19

Now this man went over to the land of Jershon also, to preach these things among the people of Ammon, which were once the people of the Lamanites.

This man also went to the land of Jershon. He taught these things to the people of Ammon, who used to be Lamanites.

This man also went to Jershon to preach these things among the people of Ammon, who had once been Lamanites.