Complex sentence: Like the 956 they won in the 80's, Joest would attempt for a third straight win without any sucess, by then they have gained the reputation of winning back to back races at the using the same car on two occasions.
Split into simpler sentences: Like the 956 they won in the 80's, Joest would attempt for a third straight win, without success though. By then, Joest has gained the reputation of winning back to back races by using the same car on two occasions.