Complex sentence: Mark J. Rozell is dean of the Schar School of Policy and Government of George Mason University in Virginia, in the United States, where he also holds the Ruth D. and John T. Hazel chair in public policy.
Split into simpler sentences: Mark J. Rozell is dean of the Schar School of Policy and Government at George Mason University in Virginia (USA). He also holds the Ruth D. and John T. Hazel Chair in Public Policy.