Complex sentence: Before joining the Philadelphia Fed, Plosser was for 12 years the Dean of the William E. Simon Graduate School of Business Administration at the University of Rochester and served concurrently as the school's John M. Olin Distinguished Professor of Economics and Public Policy.
Split into simpler sentences: Before joining the Philadelphia Fed, Plosser was the Dean of the William E. Simon Graduate School of Business Administration at the University of Rochester for 12 years. He also served concurrently as the school's John M. Olin Distinguished Professor of Economics and Public Policy.