Complex sentence: It was written and directed by Eric Sykes, and produced by Jon Penington, and was based on a comedy sketch, called "Sykes and a Plank", which was written by Eric Sykes for his comedy television series "Sykes".
Split into simpler sentences: It was written and directed by Eric Sykes, and produced by Jon Penington. The story was based on a comedy sketch called "Sykes and a Plank", which was written by Eric Sykes for his comedy television series "Sykes".