Complex sentence: The Parkin Site is the type site for the Parkin phase, an expression of Late Mississippian culture, believed by many archeologists to be the province of Casqui visited by Spanish explorer Hernando de Soto in 1542.
Split into simpler sentences: The Parkin Site is the type site for the Parkin phase, an expression of Late Mississippian culture. Many archeologists believe it to be part of the province of "Casqui", documented as visited by Spanish explorer Hernando de Soto in 1542.