Complex sentence: Unlike the series' lead, Adam West, Ward was required to do some dangerous stunt work, because his costume revealed more of his face, making it impractical for all of his stunt scenes to be performed by a stuntman.
Split into simpler sentences: Unlike the series' lead, Adam West, Ward was required to do some dangerous stunt work. He was told that this was because his costume revealed more of his face, making it impractical for all of his stunt scenes to be performed by a stuntman.