Complex sentence: In 1964 he graduated from the Conservatory with two specialities at the same time; composition (under professor Orest Evlakhov) and musicology (under professor F.A. Rubtsov), and shortly thereafter published the vocal cycle that would make his name, the "Russian Notebook".
Split into simpler sentences: In 1964 he graduated from the Conservatory with two specialities: composition (under professor Orest Evlakhov) and musicology (under professor F.A. Rubtsov). Shortly thereafter, Gavrilin published the vocal cycle that would make his name, the "Russian Notebook".