Complex sentence: Shortly after, a rescue team arrives on the scene to arrest Bonin and as Bonin is moving towards the police cruiser, he realizes that Detective St. John (Michael Rooker), whom he saw at the newsstand, was the one watching him after all.
Split into simpler sentences: Shortly after, a rescue team arrives on the scene to arrest Bonin. As he is taken into custody, he realizes that Detective St. John (Michael Rooker), whom he saw at the newsstand, was the one watching him after all.