Complex sentence: Upon leaving the army career, he graduated in Law at LUISS Guido Carli University of Rome in 1993, then he transfered to the United States, where in 1998 he obtained the Master of Law of the New York University School of Law.
Split into simpler sentences: Upon leaving the army career, he graduated in Law at LUISS Guido Carli University of Rome in 1993. He then moved to the United States, where in 1998 he obtained the Master of Law of the New York University School of Law.