Complex sentence: A few days later, under mounting American pressure, Diem signed the Joint Communique with senior Buddhist leaders, making various concessions to the Buddhists, who in turn agreed to stop the civil unrest and return to normal life.
Split into simpler sentences: A few days later, under mounting American pressure, he signed the Joint Communique with senior Buddhist leaders. The accord made various concessions to the Buddhists, who in turn agreed to stop the civil unrest and return to normal life.