Complex sentence: They also usually have one arm replaced with a prosthetic one, bearing one of a variety of multipurpose tools in place of a humanoid hand, and flat white skin, giving them an almost zombie-like appearance.
Split into simpler sentences: They also usually have one arm replaced with a prosthetic one, bearing one of a variety of multipurpose tools in place of a humanoid hand. Another defining feature is flat white skin, giving them an almost zombie-like appearance.