Complex sentence: All four were reactivated and armed with missiles during the 1980s as part of the 600-ship Navy initiative; during Operation Desert Storm in 1991, "Missouri" and "Wisconsin" fired missiles and guns at Iraqi targets.
Split into simpler sentences: All four were reactivated and armed with missiles during the 1980s as part of the 600-ship Navy initiative. During Operation Desert Storm in 1991, "Missouri" and "Wisconsin" fired missiles and guns at Iraqi targets.