Complex sentence: Grim is attacked by vampire bat eleves, and Mandy faces off with the Head "Head" Vampire, Billy is wandering aroud the workshop and finds the Vampire Antidote.
Split into simpler sentences: Grim is attacked by vampire bat elves, and Mandy faces off with the Head "Head" Vampire. Meanwhile, Billy is wandering aroud the workshop and finds the Vampire Antidote.