Complex sentence: Nixon's visit to the People's Republic of China in 1972 opened diplomatic relations between the two nations, and he initiated détente and the Anti-Ballistic Missile Treaty with the Soviet Union the same year.
Split into simpler sentences: Nixon's visit to the People's Republic of China in 1972 opened communications between the two nations and eventually led to the normalization of diplomatic relations. He initiated détente and the Anti-Ballistic Missile Treaty with the Soviet Union the same year.