Complex sentence: Boris studied clarinet, classical theory and orchestration at the renowned Gnessin Institute in Moscow, performance technique at the P.I. Tchaikovsky Moscow Conservatory, and self-taught on tenor and alto sax.
Split into simpler sentences: Boris studied clarinet, classical theory and orchestration at the renowned Gnessin Institute in Moscow and performance technique at the P.I. Tchaikovsky Moscow Conservatory. He self-taught on tenor and alto sax.