sentences:  For several years, he experienced political persecution, but in 1948, he was able to return to Lviv, and, with the help of the Soviet Ukrainian historian, Fedir Shevchenko, learned to adapt his historical writing to Soviet conditions and to the Soviet censors.From 1951, he headed the Institute of Social Sciences at the Lviv branch of the Academy of Sciences of the Ukrainian SSR.In 1958, he was elected an "Academic" of the Academy of Sciences of the Ukrainian SSR.