Complex sentence: His father, Jack (Dudley Moore), is a surgeon and working hard to get a promotion of the chief of staff job at his hospital and also who wants his son to become a doctor as well, but Chris is not interested.
Split into simpler sentences: His father, Jack (Dudley Moore), is a surgeon and working hard to get a promotion to the position of the chief of staff at his hospital. He also wants his son to become a doctor as well, but Chris is not interested.