Complex sentence: He was a medical intern and resident at Columbia-Presbyterian Medical Center, New York, and from 1959 to 1962, a National Foundation Research Fellow, working with Bengt Borgström and others at the University of Lund, Sweden.
Split into simpler sentences: He was a medical intern and resident at Columbia-Presbyterian Medical Center, New York. From 1959 to 1962, he was a National Foundation Research Fellow, working with Bengt Borgström at the University of Lund, Sweden.