Complex sentence: Iraq and Afghanistan Veterans of America (IAVA) is the nation's first and largest nonprofit, nonpartisan organization for veterans of the wars in Iraq and Afghanistan and has more than 125,000 veteran members and civilian supporters nationwide.
Split into simpler sentences: Iraq and Afghanistan Veterans of America (IAVA) is an advocacy group dedicated to United States veterans of the War in Iraq and War in Afghanistan. The group claims to be the nation's first and largest nonprofit, nonpartisan organization for veterans of the wars and has more than 125,000 veteran members and civilian supporters nationwide.