Complex sentence: Rubens graduated from Stuyvesant High School in 1957, has an undergraduate degree from Cornell University, a graduate degree from Brandeis University, and is a retired mathematics professor of Pace University in New York.
Split into simpler sentences: Rubens graduated from Stuyvesant High School in 1957, has an undergraduate degree from Cornell University and a graduate degree from Brandeis University. He is a retired mathematics professor of Pace University in New York.