Original sentence: He had long term visits at Stanford University (1953–4), the Courant Institute (1961), the University of New Mexico (1969), the University of Maryland (1973), and ETH Zürich (1979)
Edited sentence: He had long term visits at Stanford University (1953–4), the Courant Institute (1961), the University of New Mexico (1969), the University of Maryland, College Park (1973), and ETH Zürich (1979)