Complex sentence: Rubenstein later developed a career as a composer for film and television while Van Leeuwen went on to play with notable acts such as A Perfect Circle and is currently a member of Queens of the Stone Age.
Split into simpler sentences: Rubenstein later developed a career as a composer for film and television while Van Leeuwen went on to play with notable acts such as A Perfect Circle. He is currently a member of Queens of the Stone Age.