Complex sentence: McCoy primarily researches and writes about Philippines history and on the Golden Triangle drug trades of opium and heroin; his "The Politics of Heroin in Southeast Asia" was a landmark work documenting the interactions between the CIA and drug cartels in Southeast Asia.
Split into simpler sentences: McCoy primarily researches and writes about Philippines history and on the Golden Triangle drug trades of opium and heroin. His "The Politics of Heroin in Southeast Asia" was a landmark work documenting the interactions between the CIA and drug cartels in Southeast Asia.