Complex sentence: The name Chevrolet Greenbrier was used by the Chevrolet division of General Motors for two vehicles, the first one being a van based on the Corvair and produced in the model years 1961 to 1965.
Split into simpler sentences: The name Chevrolet Greenbrier was used by the Chevrolet division of General Motors for two vehicles. The first vehicle was a van based on the Corvair, produced between model years 1961 to 1965.