Complex sentence: Iestyn Davies began singing as a boy treble in the choir of St John's College, Cambridge and later, as a St John's undergraduate, he sang bass and then countertenor in the same College choir before graduating in Archaeology and Anthropology.
Split into simpler sentences: Iestyn Davies began singing as a boy treble in the choir of St John's College, Cambridge. Years later, as a St John's undergraduate, he sang bass and then countertenor in the same choir before graduating in Archaeology and Anthropology.