Complex sentence: Knowing they are MI5 officers, Osbourne demands everything Tom knows about their operation; when Tom fails to cooperate, Osbourne forces Helen's hand, followed by her head into a deep fryer, before shooting her.
Split into simpler sentences: Knowing they are MI5 officers, Osbourne demands everything Tom knows about their operation. When Tom fails to cooperate, Osbourne forces Helen's hand, followed by her head into a deep fryer, before shooting her.