Complex sentence: A large flat-topped shell mound, the Withlacoochee River Platform Mound, is next to the Withlacoochee River in Citrus County, but it has not been investigated, and whether it has any connection to the Safety Harbor culture is unknown.
Split into simpler sentences: A large flat-topped shell mound, the Withlacoochee River Platform Mound, is next to the Withlacoochee River in Citrus County, but it has not been investigated. Whether it has any connection to the Safety Harbor culture is unknown.