Original: In 1948, Andrei Zhdanov appointed Khrennikov Secretary of the Union of Soviet Composers, a job he would keep until the collapse of the Soviet Union in 1991 and for which he is most remembered.
Simplified: Tikhon Khrennikov became Secretary to the Union of Soviet Composers in 1948, at the time when Stalin was dictator. He continued in this job until the collapse of the Soviet Union in 1991.