Complex sentence: At the time the townsfolk thought it was as patriotic as either Union and Franklin since the United States won a large victory there, and they were certain that no other town would already have chosen such a unique name.
Split into simpler sentences: At the time the townsfolk thought it was as patriotic as either Union and Franklin since the United States won a large victory there. And they were certain that no other town would already have chosen such a unique name.