Complex sentence: Hewett's dealings with Maria Martinez, the great potter of San Ildefonso Pueblo, were instrumental in establishing San Ildefonso as a center for Native American pottery, and for the rebirth of pottery as a significant folk art form in the region.
Split into simpler sentences: Hewett's dealings with Maria Martinez, the great potter of San Ildefonso Pueblo, were instrumental in establishing San Ildefonso as a center for Native American pottery. He helped stimulate the rebirth of pottery as a significant folk art form in the region.