Complex sentence: Cecil was to push his face through several knives to hit a switch and release himself, but the chair collapsed via freeing himself but Cecil died after falling into a tangle of razor-wire trying to kill John with a large piece of the chair.
Split into simpler sentences: Cecil was to push his face through several knives to hit a switch and release himself. The chair collapsed via freeing himself but Cecil died after falling into a tangle of razor-wire trying to kill John with a large piece of the chair.