Complex sentence: However, he is chased by the police until he is backed against a wall; he uses the last portable hole in the briefcase to go through the wall and seemingly escape, but it's revealed that the other side is inside a prison.
Split into simpler sentences: However, he is chased by the police until he is backed against a wall; he uses the last portable hole in the briefcase to go through the wall and seemingly escape. But it's revealed that the other side is inside a prison.