Complex sentence: The first Principal, Clifford Leech, a distinguished academic and widely-acknowledged expert on Jacobean literature, served for several years in this role before going on to become Professor of English at the University of Toronto.
Split into simpler sentences: The first Principal, Clifford Leech, a distinguished academic and widely-acknowledged expert on Jacobean literature, served for several years in this role. He later went on to become Professor of English at the University of Toronto.