Complex sentence: Arlen eventually covers herself in feces, causing one of the cannibals to untie her so she can be washed, using this moment to attack and kill the woman and escape, on only a skateboard.
Split into simpler sentences: Arlen eventually covers herself in feces, causing one of the cannibals to untie her so she can be washed. Arlen uses this moment to attack the woman and escape, using only a skateboard.