Complex sentence: HMS "Aylmer" served exclusively with the 5th Escort Group; the 5th Escort Group was commanded by Cdr Donald MacIntyre and operated in the North Atlantic and off Normandy and was part of Operation Goodwood.
Split into simpler sentences: HMS "Aylmer" served exclusively with the 5th Escort Group. The 5th Escort Group was commanded by Cdr Donald MacIntyre and operated in the North Atlantic and off Normandy and was part of Operation Goodwood.