Complex sentence: They then corner Oskar in the local swimming pool and attempt to drown him, however Eli rescues Oskar and kills two of the other boys, and Eli and Oskar flee the city with the remaining money, puzzles and each other.
Split into simpler sentences: They then corner Oskar in the local swimming pool and attempt to drown him. However, Eli rescues Oskar and kills two of the other boys, and the two flee the city with the remaining money, puzzles and each other.