Complex sentence: After his release from the Brigade, Riklis graduated from the Academy of Music in piano and conducting, and took courses under Igor Markevitch at the Mozarteum University of Salzburg from 1953--56.
Split into simpler sentences: After his release from the Brigade, Riklis graduated from the Academy of Music in piano and conducting. There he took courses under Igor Markevitch at the Mozarteum University of Salzburg from 1953--56.