Complex sentence: Replacing the MGA in 1962, production of the MGB and its variants continued until 1980, achieving sales for the MGB, MGC and MGB GT V8 combined of 523,836 cars.
Split into simpler sentences: Replacing the MGA in 1962, production of the MGB and its variants continued until 1980. Sales for the MGB, MGC and MGB GT V8 combined totaled 523,836 cars.