Complex sentence: Struever had recently founded the The Center for American Archeology located in Kampsville, Illinois and became one of the largest sites of its era, drawing over 10,000 yearly visitors; it is considered to be the Center for American Archeology's most important discovery.
Split into simpler sentences: Struever had recently founded the The Center for American Archeology located in Kampsville, Illinois. Under his leadership, the site became one of the largest excavations of its era, drawing over 10,000 yearly visitors; it is considered to be the Center for American Archeology's most important discovery.