Complex sentence: The first of these was mounted on the top of the island in July 1942, shortly after she was completed, and the other was added later in the year on the port side of the hull, outboard of the rear elevator.
Split into simpler sentences: The first of these was mounted on the top of the island in July 1942, shortly after she was completed, and the other was added later in the year. This latter system was fitted on the port side of the hull, outboard of the rear elevator.