Complex sentence: Cohen had been a member of the faculty at Tufts University since 1971 and until he joined the faculty at UCSB he was the "William L. Clayton Professor of International Economic Affairs" at the Fletcher School of Law and Diplomacy, Tufts University.
Split into simpler sentences: Cohen had been a member of the faculty at Tufts University since 1971. Until he joined the faculty at UCSB he was the "William L. Clayton Professor of International Economic Affairs" at the Fletcher School of Law and Diplomacy, Tufts University.