Complex sentence: He has designed the main characters appeared as a director for many episodes of the animated television series Rugrats from 1991-1998 and acts as a storyboard artist for other later episodes from 2001-2004 and the three theatrical films.
Split into simpler sentences: He has designed the main characters appeared as a director for many episodes of the animated television series Rugrats from 1991-1998. And acts as a storyboard artist for other later episodes from 2001-2004 and the three theatrical films.