Complex sentence: In 1995, O'Brien received a B.S. degree (with honors) in Biology from the University of Notre Dame and later received his M.D. degree from Indiana University School of Medicine (IUSoM), Indianapolis, Indiana in 2000.
Split into simpler sentences: In 1995, O'Brien received a B.S. degree (with honors) in Biology from the University of Notre Dame. He received his M.D. degree from Indiana University School of Medicine (IUSoM), Indianapolis, Indiana in 2000.