Complex sentence: In 1987 he attended the Egyptian Command and Staff College; in 1992 he continued his military career by enrolling in the British Command and Staff College, and later (2006) in the United States Army War College.
Split into simpler sentences: In 1987 he attended the Egyptian Command and Staff College. In 1992 he continued his military career by enrolling in the British Command and Staff College, and in 2006 enrolled in the United States Army War College.