Complex sentence: The most pronounced changes were to the front fenders, hood, grille, and bumpers, which tended to follow their full-size truck counterparts in each era, much of this was a result of the need to meet Federal "crashworthiness" standards.
Split into simpler sentences: The most pronounced changes were to the front fenders, hood, grille, and bumpers, which tended to follow their full-size truck counterparts in each era. Much of this was a result of the need to meet Federal "crashworthiness" standards.