Complex sentence: In most of the stories, he gets his comeuppance as a frequent victim of Paddington's misadventures; however, he does sometimes benefit from Paddington's mistakes and has even rewarded him for them on occasion.
Split into simpler sentences: In most of the stories, he gets his comeuppance as a frequent victim of Paddington's misadventures. Although he does sometimes benefit from Paddington's mistakes and has even rewarded him for them on occasion.