Original sentence: After two Brothers to the Rescue aircraft were shot down by Cuban MiGs in February 1996 and four American citizens were murdered, on the basis of information sent to Cuba by an infiltrator of the group, the Clinton administration launched a crackdown.The Cuban government had long sought to undermine the counter-revolutionary activities of anti-Castro exile Cuban-Americans, since the 1962 Bay of Pigs Invasion onwards (United States and state terrorism#Cuba (1956-present))
Edited sentence: However after two Brothers to the Rescue aircraft were shot down by Cuban MiGs in February 1996 and four American citizens were murdered, on the basis of information sent to Cuba by an infiltrator of the group, the Clinton administration launched a crackdown.The Cuban government had long been responding to the counter-revolutionary, often violent, activities of anti-Castro exile Cuban-Americans, from the 1962 Bay of Pigs Invasion onwards (United States and state terrorism#Cuba (1956-present))