Ether 11:18

And it came to pass that he did overthrow Moron and obtain the kingdom; wherefore Moron dwelt in captivity all the remainder of his days; and he begat Coriantor.

He beat Moron and took the kingdom. So Moron stayed in prison for the rest of his life. He had a son named Coriantor.

He overthrew Moron and seized the throne. Moron spent the rest of his life in captivity. While in prison, he had a son named Coriantor.