Alma 62:30

Now it came to pass that Moroni, after he had obtained possession of the city of Nephihah, having taken many prisoners, which did reduce the armies of the Lamanites exceedingly, and having retained many of the Nephites which had been taken prisones, which did strengthen the army of Moroni exceedingly; therefore Moroni went forth from the land of Nephihah to the land of Lehi.

After Moroni had taken the city of Nephihah, he had taken many prisoners. This made the Lamanite armies much smaller. He had also got back many Nephites who had been taken as prisoners. This made Moroni’s army much stronger. So Moroni went from the land of Nephihah to the land of Lehi.

After taking Nephihah and capturing many prisoners—which drastically weakened the Lamanite armies—and after freeing many Nephite prisoners—which greatly strengthened his army—Moroni moved on from Nephihah to the land of Lehi.