Complex sentence: When they arrive at Debra's house, they find her mother and brother reanimated and her father being consumed; escape the house; and are stopped by different National Guardsmen, who rob them, leaving them only their weapons.
Split into simpler sentences: When they arrive at Debra's house, they find her reanimated mother and brother feeding on her father. They escape from the house and are stopped by different National Guardsmen, who rob them, leaving them only their weapons.