Complex sentence: Bart has grown into a handsome albeit bitter and power hungry young man, jealous that Chris is the guardian of his money until he reaches twenty-five and of Cathy's incestuous relationship with her brother.
Split into simpler sentences: Bart has grown into a handsome albeit bitter and power hungry young man. He is jealous that Chris is the guardian of his money until he reaches twenty-five and of Cathy's incestuous relationship with her brother.