Complex sentence: Jaffe and Field were among the founders of the Committee for a Democratic Far Eastern Policy in August 1945, which opposed the policy of Harry S. Truman's administration to support Chiang Kai-shek and his Kuomintang government in China.
Split into simpler sentences: Jaffe and Field were among the founders of the Committee for a Democratic Far Eastern Policy (CDFEP). The CDFEP, established in August 1945, was opposed to the policy of Harry S. Truman's administration to support Chiang Kai-shek and his Kuomintang government in China.