Complex sentence: All cars are to be manufactured between the years 1966 and 1979 and consist of four classes, Proto 1 and Proto 2, which consist of Group P and S cars with either +2.0L or -2.0L size engine.
Split into simpler sentences: All cars are to be manufactured between the years 1966 and 1979. It consists of four classes, Proto 1 and Proto 2, which consist of Group P and S cars with either +2.0L or -2.0L size engine.