Complex sentence: His father and stepmother Bill and Trish are influenced by the curse, Bill becoming convinced that Trish is having an affair but his confrontation is short-lived when Trish wallops him with a frying pan, killing him.
Split into simpler sentences: His father and stepmother Bill and Trish are influenced by the curse, Bill becoming convinced that Trish is having an affair. However, his confrontation is short-lived when Trish wallops him with a frying pan, killing him.