Original sentence: It refers to the foreign policy of several Western countries, from the Treaty of Versailles in 1919 to the decades-long aftermath of World War II, the Cold War.The concept is disputed by some, who argue that Churchill and Roosevelt had not other option but to accept any Stalin's demand in Teheran and later in Yalta.Western betrayal is a concept, particularly popular among several Central European  nations, (including Poland, Czech Republic and Slovakia)
Edited sentence: It refers to a perception of the foreign policy of several Western countries, from the Treaty of Versailles in 1919 to the decades-long aftermath of World War II, the Cold War.Western betrayal is a concept which is popular among several Central European  nations, particularly Poland and the former Czechoslovakia