Complex sentence: They rarely bother with disguise or force, as they rely on their charm and good looks to steal the most unobtainable objects--not usually for their own support, but for the thrill of the act itself.
Split into simpler sentences: They rarely bother with disguise or force, as they rely on their charm and good looks to steal the most unobtainable objects. Not usually for their own support, but for the thrill of the act itself.