Complex sentence: Mao and the CCP took Eisenhower's response as a political affront to socialist countries, and the PRC responded with political rallies demanding that Khrushchev act against the American aggressors.
Split into simpler sentences: Mao and the CCP took Eisenhower's response as an affront to socialist countries, and the PRC responded in kind. Mass political rallies demanded that Khrushchev act against the American aggressors.