Complex sentence: The helicopter was initally designated "WAH-64" by Westland Helicopters and was later designated "Apache AH Mk 1" (often shortened to "Apache AH1") by the Ministry of Defence.
Split into simpler sentences: The helicopter was named "WAH-64" by Westland Helicopters. It is designated "Apache AH Mk 1" (or shortened to "Apache AH1") by the Ministry of Defence.