Complex sentence: The American Committee for East-West Accord is the name of two related organizations that have existed during separate periods of American history whose goals have been to promote, in the United States, conciliation with the Soviet Union and, later, the Russian Federation.
Split into simpler sentences: The American Committee for East-West Accord is the name of two related organizations that have existed during separate periods of American history. The purpose of both groups has been to promote, in the United States, conciliation with the Soviet Union and, later, the Russian Federation.