Complex sentence: The failed invasion strengthened the position of Castro's administration, who proceeded to openly proclaim their intention to adopt socialism and strengthen ties with the Soviet Union, leading to the events of the Cuban Missile Crisis of 1962.
Split into simpler sentences: The failed invasion strengthened the position of Castro's administration, who proceeded to openly proclaim their intention to adopt socialism and strengthen ties with the Soviet Union. This led eventually to the events of the Cuban Missile Crisis of 1962.