Complex sentence: He was slow to make adjustments during games and found it difficult to accept responsibility, always blaming others for the team's misfortunes, and his character changed from when he came to Notre Dame to when he left.
Split into simpler sentences: He was slow to make adjustments during games and found it difficult to accept responsibility, always blaming others for the team's misfortunes. His character changed from when he came to Notre Dame to when he left.