Complex sentence: A plaque inset in the glove box door designated the number of the car out of the series of 350 (XXX of 350) And the GTV6 2.5 Maratona, of which only 150 were built.
Split into simpler sentences: A plaque inset in the glove box door designated the number of the car out of the series of 350 (XXX of 350). Later there was the GTV6 2.5 Maratona, of which only 150 were built.