Complex sentence: He entered Columbia University that fall and began using the pseudonym Stephen Donaldson so he could be open about his sexuality without embarrassing his father, who shared the name Robert Martin and now taught mathematics at Rider College in New Jersey.
Split into simpler sentences: He entered Columbia University that fall and began using the pseudonym Stephen Donaldson so he could be open about his sexuality without embarrassing his father. They both were named Robert Martin, and his father taught mathematics at Rider College in New Jersey.