Complex sentence: The 312 Ps returned to Europe for the 1970 24 Hours of Le Mans, where one of them was raced (as opposed to eleven 512s); it was among the 16 cars still running at the end.
Split into simpler sentences: The 312 Ps returned to Europe for the 1970 24 Hours of Le Mans, where one of them was raced (as opposed to eleven 512s). The car was among the 16 cars still running at the end.