Complex sentence: The structure of the house is possibly the most important element; in AMC's "The Walking Dead" the group struggled the most when they were not in a stable safe house, but once they found the prison they started to excel as a group.
Split into simpler sentences: The structure of the house is possibly the most important element; in AMC's The Walking Dead the group struggled the most when they were not in a stable safe house. But once they found the prison they started to excel as a group.