Complex sentence: She then entered The Royal Conservatory of Music where she studied from 1945--1952 and earned an associates diploma in 1949 and a licentiate diploma in 1951.
Split into simpler sentences: She then entered The Royal Conservatory of Music where she studied from 1945--1952. From the RCM she earned an associates diploma in 1949 and a licentiate diploma in 1951.