Complex sentence: The National Collegiate Athletic Association (NCAA) is a non-profit association that regulates athletes of 1,281 institutions, conferences, organizations, and individuals that organizes the athletic programs of many colleges and universities in the United States and Canada.
Split into simpler sentences: The National Collegiate Athletic Association (NCAA) is a non-profit association which regulates athletes of 1,281 institutions, conferences, organizations, and individuals. It also organizes the athletic programs of many colleges and universities in the United States and Canada.