Complex sentence: On the ship, a mysterious figure disposes of the demon and when the duo tell the figure why they're here, the figure reveals herself to be a female demon named Deema (Mila Kunis), who Augie becomes infatuated with.
Split into simpler sentences: On the ship, a mysterious figure disposes of the demon. When the duo tell the figure why they're here, the figure reveals herself to be a female demon named Deema (Mila Kunis) who Augie becomes infatuated with.