Complex sentence: Sloane was born to a Jewish family in Manhattan and attended the University of Pennsylvania before dropping out in order to join a theater company, but he stopped acting and became a runner on Wall Street after a number of negative stage reviews.
Split into simpler sentences: Sloane was born to a Jewish family in Manhattan and attended the University of Pennsylvania before dropping out in order to join a theater company. But he quit acting and became a runner on Wall Street after a number of negative stage reviews.