Complex sentence: As the officer drives Helen home, their road is blocked by a barricade they have to drive down an alley, where they spot a stalled truck; the officer gets out to investigate and is killed by a dark figure with a hook.
Split into simpler sentences: As the officer drives Helen home, their road is blocked by a barricade. The officer has no choice but to drive down an alley, where they spot a stalled truck; the officer gets out to investigate and is killed by a dark figure with a hook.