Complex sentence: Bittaker then manually strangled Schaefer until she collapsed to the ground and began convulsing; he then twisted a wire coat hanger around her neck with vise-grip pliers until Schaefer's convulsions ceased.
Split into simpler sentences: Bittaker then manually strangled Schaefer until she collapsed to the ground and began convulsing. He then twisted a wire coat hanger around her neck with vise-grip pliers until Schaefer's convulsions ceased.