Alma 4:18

Now Alma did not grant unto him the office of being High Priest over the church, but he retained the office of High Priest unto himself; but he delivered the judgment seat unto Nephihah:

Alma did not give him the job of being High Priest over the church. He kept that job for himself. But he gave the judge’s seat to Nephihah.

Alma didn’t give him the office of high priest over the church—he kept that position for himself. But he did hand over the judgment seat to Nephihah.