Complex sentence: He is one of leading American scholars in his field, having written and edited over 25 books, including three college textbooks, and has also achieved acclaim at the popular level, authoring five "New York Times" bestsellers.
Split into simpler sentences: He is one of North America's leading scholars in his field, having written and edited over 25 books, including three college textbooks. He has also achieved acclaim at the popular level, authoring five "New York Times" bestsellers.