Complex sentence: Some say that he was nothing more than a crook, who took advantage of his artists and while he was living on his horse ranch in Arizona Jelly Roll could not get enough money from his copyrights to afford health care.
Split into simpler sentences: Some say that he was nothing more than a crook. He took advantage of his artists and while he was living on his horse ranch in Arizona Jelly Roll could not get enough money from his copyrights to afford health care.