Complex sentence: The surviving members of J squad sacrifce themselves to allow Vrataski and Cage to continue resulting in them being the only ones to make it beneath the Louvre, where they find themselves being hunted by an Alpha.
Split into simpler sentences: The surviving members of J squad sacrifice themselves to allow Vrataski and Cage to continue. This results in them being the only ones to make it beneath the Louvre, where they find themselves being hunted by an Alpha.