Original sentence: He has also made an appearance in Star Wars: The Clone Wars voicing as the Son in the Season 3 Mortis trilogy of episodes, and as the iconic Sith Lord Darth Maul in the Season 4 finale episodes
Edited sentence: He has also made an appearance in Star Wars: The Clone Wars voicing as the Son in the show's least successful trilogy of episodes, and as the iconic Sith Lord Darth Maul in the Season 4 finale episodes