Complex sentence: The opening to each episode involved a guest appearance from Professor Stephen Hawking, who was often shown conversing with either Lewis-Smith or one of the gay daleks (who's convinced he's really Robert T. Ironside and so pesters Hawking for an autograph).
Split into simpler sentences: The opening to each episode involved a guest appearance from Professor Stephen Hawking. Who is often shown conversing with either Lewis-Smith or one of the gay daleks (who's convinced he's really Robert T. Ironside and so pesters Hawking for an autograph).