Complex sentence: Lorre's head was shaved for his role as Dr Gogol, a mad surgeon who replaces the wrecked hands of a concert pianist with those of an executed knife throwing murderer.
Split into simpler sentences: Lorre's head was shaved for his role as Dr Gogol, a demented surgeon. In the film, Gogol replaces the wrecked hands of a concert pianist with those of an executed knife throwing murderer.