Complex sentence: Notably, Sir Keith Williamson has commanded 23 Squadron and RAF Gütersloh and he rose to the Service's senior appointment, Chief of the Air Staff serving from 15 October 1982 to 15 October 1985.
Split into simpler sentences: Notably, Sir Keith Williamson commanded 23 Squadron and RAF Gütersloh. He served as Chief of the Air Staff from 15 October 1982 to 15 October 1985.