Complex sentence: Rune shoots Al who promptly cuts his own heart to summon the spirit but Rune foils its plans by destroying the well and Al and the Wendigo falls deep into the ice cold ocean.
Split into simpler sentences: Rune shoots Al who promptly cuts out his own heart to summon the spirit but Rune foils its plans by destroying the well and Al. The Wendigo falls deep into the ice cold ocean.