Complex sentence: Wally (George Cole) had suffered a stroke some months back and one of the side effects is that he can't remember things, even things he said 5 minutes ago, or whether he's had a meal or not.
Split into simpler sentences: Wally (George Cole) had suffered a stroke some months back. One of the side effects is that he can't remember things, even things he said five minutes ago, or whether he's had a meal or not.