swooping down on a string of exotic locales , 
(ROOT (S (VP (VBG swooping) (PRT (RP down)) (PP (IN on) (NP (NP (DT a) (NN string)) (PP (IN of) (NP (JJ exotic) (NNS locales)))))) (, ,)))
(ROOT (S (VP (VBG ) (PRT (RP )) (PP (IN ) (NP (NP (DT ) (NN )) (PP (IN ) (NP (JJ ) (NNS )))))) (, )))