Complex sentence: In 1941, with air raids on the Liverpool docks in full swing, "Conway" had already survived several near misses, and it was decided to move the ship from the Mersey to Bangor in North Wales.
Split into simpler sentences: In 1941, with air raids on the Liverpool docks taking place, "Conway" had already survived several near misses. It was decided to move the ship from the Mersey to Bangor in North Wales.