Complex sentence: In "Old School", he moves out of Leisure Towers because the rent is too high and moves in with the Heffleys.Granpa has a girlfriend named Darlene in the book "Hard Luck" and broke up with her in the book "Old School".
Split into simpler sentences: In "Old School", he moves out of Leisure Towers because the rent is too high and moves in with the Heffleys. Grandpa has a girlfriend named Darlene in the book "Hard Luck" and broke up with her in the book "Old School".