Complex sentence: By this time they withdrew the six cylinder Rekord Opel had launched, in February 1967, the Opel Commodore which shared the Rekord's body but provided more luxurious trimmings and a choice from three different sizes of six cylinder engine.
Split into simpler sentences: By this time they withdrew the six cylinder Rekord Opel had launched, in February 1967, the Opel Commodore. This shared the Rekord's body but provided more luxurious trimmings, and it came with a choice from three different sizes of six cylinder engine.