Alma 20:1

And it came to pass that when they had established a church in that land, that king Lamoni desired that Ammon should go with him to the land of Nephi, that he might show him unto his father.

After they started a church in that land, King Lamoni wanted Ammon to go with him to the land of Nephi. He wanted to show Ammon to his father.

After they established a church in that land, King Lamoni wanted Ammon to come with him to the land of Nephi so he could introduce him to his father.