Complex sentence: Harding became Director of Air Staff Briefing in 1971, having been promoted to group captain on 1 July 1972, he became Station Commander at RAF Bruggen in 1974.
Split into simpler sentences: Harding became Director of Air Staff Briefing in 1971. Promoted to group captain on 1 July 1972, he became Station Commander at RAF Bruggen in 1974.