Complex sentence: When the couples stay at a trailer park, they return from dinner to discover that Roger and Kelly's dog has been hanged, causing them to immediately leave the park in a panic and must fight off two rattlesnakes planted in their camper by the cultists.
Split into simpler sentences: When the couples stay at a trailer park, they return from dinner to discover that Roger and Kelly's dog has been hanged, causing them to immediately leave the park in a panic. Shortly after, they must fight off two rattlesnakes planted in their camper by the cultists.