Complex sentence: He completed his higher education at Gonville & Caius College, Cambridge where he gained a first-class Honours Degree in Philosophy, before continuing his studies at New College, Oxford as well as King's College London, achieving a Doctorate in 1981.
Split into simpler sentences: He completed his higher education at Gonville & Caius College, Cambridge where he gained a first-class Honours Degree in Philosophy. Sacks subsequently continued his studies at New College, Oxford as well as King's College London, achieving a Doctorate in 1981.