Complex sentence: During her scenes as the Red Devil, Hester was portrayed by stuntman Riley Schmidt, while later episodes hired a female actress, Olga Wilhelmine Munding, specifically for Hester's scenes in the costume.
Split into simpler sentences: During her scenes as the Red Devil, Hester was portrayed by stuntman Riley Schmidt. A female actress, Olga Wilhelmine Munding, was hired for later episodes, specifically for Hester's scenes in the costume.