Complex sentence: That became a cause celebre in Japan, especially among the rightists in Japan and the right wingers, who claimed Norman and Emmerson were communist sympathizers who were urging the Japanese to go communist and abandon their good relations with the United States.
Split into simpler sentences: That became a cause celebre in Japan, especially among the rightists in Japan and the right wingers. They claimed Norman and Emmerson were communist sympathizers who were urging the Japanese to go communist and abandon their good relations with the United States.