Complex sentence: Educated at the Royal Grammar School, High Wycombe, and the University of Wales, Lampeter (B.A.1978), he joined the Royal Navy in 1975, where he initially served in submarines.
Split into simpler sentences: Educated at the Royal Grammar School, High Wycombe, and the University of Wales, Lampeter (B.A.1978). Wilkinson joined the Royal Navy in 1975, where he initially served in submarines.