Complex sentence: Jackson served in the United States Marine Corps as an E5 sergeant starting two weeks after graduating high school, from 1995-1999 as well as from 2001-2002.
Split into simpler sentences: Jackson served in the United States Marine Corps as an E5 sergeant starting two weeks after graduating high school. He served two terms in the military: from 1995-1999 as well as from 2001-2002.