Complex sentence: He has appeared in a number of television shows and movies, often portraying somewhat "ballistic" characters, especially on the Nickelodeon television series "iCarly", he plays Lewbert who is the mean and nasty doorman of Carly's apartment building.
Split into simpler sentences: He has appeared in a number of television shows and movies, often portraying somewhat "ballistic" characters, especially on television shows. For example, on the Nickelodeon television series "iCarly", he plays Lewbert who is the mean and nasty doorman of Carly's apartment building.