Complex sentence: The GMC Chevette was manufactured by GMC in Argentina from 1980--1995, and is a variation on the General Motors T-car platform which includes Opel Kadett, Chevrolet Chevette and Isuzu Gemini.
Split into simpler sentences: The GMC Chevette is an automobile which was manufactured by GMC in Argentina from 1980 to1995. It is a variation on the General Motors T-car platform which includes Opel Kadett, Chevrolet Chevette and Isuzu Gemini.