Complex sentence: David M. Oshinsky (born 1944) is an American historian; he currently holds the Jack S. Blanton chair in history at the University of Texas at Austin and is a distinguished scholar in residence at New York University.
Split into simpler sentences: David M. Oshinsky (born 1944) is an American historian. He currently holds the Jack S. Blanton chair in history at the University of Texas at Austin and is a distinguished scholar in residence at New York University.