Complex sentence: Founded one week before 9/11,Killian's Angels was an all-female Celtic-influenced band based in Las Vegas, Nevada until 2010 when the addition of fiddler extraordinaire, Willy Wainwright, transformed it into an "all girl band with a Willy".
Split into simpler sentences: Founded one week before 9/11,Killian's Angels was an all-female Celtic-influenced band based in Las Vegas, Nevada. The addition of fiddler extraordinaire, Willy Wainwright in 2010, transformed it into an "all girl band with a Willy".