Complex sentence: The series starred Nigel Planer, Rik Mayall and Adrian Edmondson as its three title characters, who had previously worked together in "The Young Ones", and was written by Ben Elton with "Additional Material" credited to Mayall.
Split into simpler sentences: The series starred Nigel Planer, Rik Mayall and Adrian Edmondson, who had previously worked together in "The Young Ones", as its three title characters respectively. It was written by Ben Elton with "Additional Material" credited to Mayall.