Complex sentence: Crimea is an autonomous republic of Ukraine with a predominantly ethnic-Russian population, which was transferred from the Russian SFSR to the Ukrainian SSR in 1954 by Nikita Khrushchev.
Split into simpler sentences: Crimea is an autonomous republic of Ukraine with a predominantly ethnic-Russian population. Crimea was transferred from the Russian SFSR to the Ukrainian SSR in 1954 by Nikita Khrushchev.