Complex sentence: During the voyage Imperator developed a severe list which was found to be a faulty ash ejector, at this point Cunard decided that the ship was in need of a major overhaul and was withdrawn from service.
Split into simpler sentences: During the voyage Imperator developed a severe list which was found to be caused by a faulty ash ejector. At this point Cunard decided that the ship was in need of a major overhaul and was withdrawn from service.