Complex sentence: Marie is stranded from the others, and finds herself taking temporary refuge at a small house nearby, where she holds out against hordes of undead Nazi soldiers, until she is able to make her way to the village.
Split into simpler sentences: Marie is stranded from the others, and finds herself taking temporary refuge at a small house nearby. She encounters undead Nazi soldiers, and is forced to survive against hordes of them, until she is able to make her way to the village.