Complex sentence: Prior to the Bay of Pigs invasion, Boehm infiltrated Cuba on an intelligence-gathering mission and later helped train a cadre of Cuban ex-patriates in amphibious assaults to carry out the invasion.
Split into simpler sentences: Prior to the Bay of Pigs invasion, Boehm infiltrated Cuba on an intelligence-gathering mission. He trained Cuban ex-patriates in amphibious assaults to carry out the invasion.