Complex sentence: Having never executed a woman in the electric chair, those responsible for carrying out the death warrant devised a new way to place the electrodes upon her, deciding to slit her dress and place the electrode on her ankle.
Split into simpler sentences: Having never executed a woman in the electric chair, those responsible for carrying out the death warrant devised a new way to place the electrodes upon her. They decided to slit her dress and place the electrode on her ankle.