Complex sentence: The affair was accompanied by harsh propaganda campaign in the media and was perceived as a sign of demise of the Khrushchev Thaw and a group of Soviet notables sent a letter to Leonid Brezhnev asking not to rehabilitate Stalinism.
Split into simpler sentences: The affair was accompanied by harsh propaganda campaign in the media and was perceived as a sign of demise of the Khrushchev Thaw. A group of Soviet luminaries sent a letter to Leonid Brezhnev asking not to rehabilitate Stalinism.