Complex sentence: The Series 70 (models 70 and 75) was a full-size V8-powered series of cars produced by Cadillac from the 1930s through the 1980s.
Split into simpler sentences: The Series 70 (models 70 and 75) is a car that was made by Cadillac. It was one of Cadillac's full-size V8-powered cars, produced from the 1930s through the 1980s.