Complex sentence: Trifković is the author of "Sword of the Prophet", a book on the history and doctrines of Islam., he comments on Balkan politics and is a regular columnist for several conservative publications in the United States.
Split into simpler sentences: Trifković is the author of "Sword of the Prophet", a book on the history and doctrines of Islam. He comments on Balkan politics and is a regular columnist for several conservative publications in the United States.