Complex sentence: The following period, called Qualla Phase pottery, is found to be the result of the Lamar and Pisgah merging culture's life styles appearing about A.D.1450 leading to one of the region's historic Nations, the Cherokee Nation.
Split into simpler sentences: The following period, called Qualla Phase pottery, is found to be the result of the (Lamar) and Pisgah merging culture's life styles appearing about A.D.1450. This was leading to one of the region's historic Nations, the Cherokee Nation.