Complex sentence: Attached to the Home Fleet "Onslow" served mostly as an escort to the Arctic Convoys, though she also saw detached service in the Mediterranean during "Operation Harpoon" in 1942, and in the English Channel before and after the Normandy landings in mid- 1944.
Split into simpler sentences: Attached to the Home Fleet, "Onslow" served mostly as an escort to Arctic Convoys. She also saw detached service in the Mediterranean during "Operation Harpoon" in 1942, and in the English Channel before and after the Normandy landings in mid- 1944.