Complex sentence: Brandi lures Rachel to an old cabin in the nearby swamps with the intention of sex only to both try to kill each other, which Brandi gets the upper hand, but they both get discovered.
Split into simpler sentences: Brandi lures Rachel to an old cabin in the nearby swamps with the intention of sex. Rachel and Brandi, both try to kill each other, and though Brandi gets the upper hand, they get discovered.