Complex sentence: During the summers of 1949 and 1950 he trained with various composers including Aaron Copland and Sergev Koussevitzky, and between 1950 and 1954 Campos-Parsi studied with Hindemith at Yale University and with Nadia Boulanger in Paris.
Split into simpler sentences: During the summers of 1949 and 1950 he trained with composers such as Aaron Copland and Sergev Koussevitzky. Between 1950 and 1954 Campos-Parsi studied with Hindemith at Yale University and with Nadia Boulanger in Paris.