Complex sentence: He taught at University of Delaware, Harvard University, the University of Toronto, University of Michigan, the New School for Social Research, and Columbia University, where he was the Joseph L. Buttenwieser Professor of Social Science.
Split into simpler sentences: He taught at the University of Delaware, Harvard University, the University of Toronto, the University of Michigan, the New School for Social Research, and Columbia University. At Columbia, he was the Joseph L. Buttenwieser Professor of Social Science.