Complex sentence: Ill heath forced Salmond to retire in 1943; however he remained President of the Royal Air Force Club for 23 years and regularly appeared at major RAF events.
Split into simpler sentences: Ill heath forced Salmond to retire in 1943 although he remained in close contact with the Service in the following years. Salmond was President of the Royal Air Force Club for 23 years and regularly appeared at major RAF events.