Complex sentence: All the best car were new, Porsche entered two 936 and one 935, and the Renault Alpine A442 turbo also made its first appearance at Le Mans, although only one car was entered.
Split into simpler sentences: All the best car were new, Porsche entered two 936 and one 935. The Alpine-Renault A442 T made also its first appearance in Le Mans, only one car was entered.