Complex sentence: He attended Amherst College as an undergraduate, MA from NYU, and his PhD at Columbia University, and worked for 10 years at publishing companies in New York City between undergrad and graduate school.
Split into simpler sentences: He attended Amherst College as an undergraduate, studied for an MA at New York University, and received a PhD at Columbia University. He worked for 10 years at publishing companies in New York City between before attending graduate school.