Complex sentence: The pair plan to make a break for the rest of their group, but the girl appears briefly in the house and Keller goes to find her, meanwhile Anderson is confronted by the dead Wilcox who reveals himself to be a hideous creature.
Split into simpler sentences: The pair plan to make a break for the rest of their group, but the girl appears briefly in the house and Keller goes to find her. Meanwhile, Anderson is confronted by the dead Wilcox who reveals himself to be a hideous creature.