Complex sentence: Dr. Brad Stephan Gregory (born 28 May 1963 in Woodstock, Illinois) is an Associate Professor of History at the University of Notre Dame, whose principal field of study is the religious wars of the Reformation.
Split into simpler sentences: Dr. Brad Stephan Gregory (born 28 May 1963 in Woodstock, Illinois) is an Associate Professor of History at the University of Notre Dame. His principal field of study is the religious wars of the Reformation.