Complex sentence: Eve sees the Woman in Black while exploring the graveyard, where she finds the grave of Nathaniel Drablow, and while chasing the Woman, she falls down onto the beach and is overcome by visions of Nathaniel's death.
Split into simpler sentences: Eve sees the Woman in Black in the graveyard, where she finds the grave of Nathaniel Drablow. She chases the ghost to the beach, and is overcome by visions of Nathaniel's death.