Complex sentence: He was a storyboard artist for "Justice League" before being promoted in the show's renamed third season and went on to direct half of the episodes of "JLU" alongside fellow DCAU director Dan Riba, including the final episode "Destroyer".
Split into simpler sentences: He was a storyboard artist for "Justice League" before being promoted in the show's renamed third season. He went on to direct half of the episodes of "JLU" alongside fellow DCAU director Dan Riba, including the final episode "Destroyer".