Complex sentence: A version of the film, released in 1956 during Khrushchev Thaw, was disowned by Kozintsev because the reediting was done without his participation.
Split into simpler sentences: A version of the film was released in 1956 during Khrushchev Thaw. It was disowned by Kozintsev because the reediting of the film was done without his participation.