Complex sentence: Seizing the bag, Beta Ray Bill lures the demons back into the Realm of the Great Beasts claming he has been in worse situations before, forcing Guardian to seal the portal behind him, effectively sacrificing himself to save the planet.
Split into simpler sentences: Seizing the bag, Beta Ray Bill lures the demons back into the Realm of the Great Beasts claiming he has been in worse situations before. Forcing Guardian to seal the portal behind him, he effectively sacrifices himself to save the planet.