Complex sentence: After graduating High School in Missouri, he enlisted into the U.S.Army and served as an M1A1 Tank Gunner during Operation Desert Storm, noteably participating in the infamous "Battle of 73 Easting".
Split into simpler sentences: After graduating High School there he enlisted into the U.S.Army and served as an M1A1 Tank Gunner during Operation Desert Storm. Noteably participating in the infamous "Battle of 73 Easting".