Complex sentence: Use of the gun show loophole was advocated in the summer of 2011 by al-Qaeda operative, Adam Gadahn, who said: America is absolutely awash with easily obtainable firearms.
Split into simpler sentences: Use of the gun show loophole was advocated in the summer of 2011 by al-Qaeda operative, Adam Gadahn. He said: America is absolutely awash with easily obtainable firearms.