Complex sentence: He fights Gravity, Frog-Man, Geiger, Scarlet Spiders, and Firestar; when he's surrounded he tosses a grenade at Gravity but Geiger catches it and is seriously injured, creating an easy distraction for him to escape.
Split into simpler sentences: He fights Gravity, Frog-Man, Geiger, Scarlet Spiders, and Firestar. When he's surrounded he tosses a grenade at Gravity but Geiger catches it and is seriously injured, creating an easy distraction for him to escape.