sitting in a downtown café , overhearing a bunch of typical late-twenty-somethings natter on about nothing , and 
(ROOT (S (VP (VP (VBG sitting) (PP (IN in) (NP (DT a) (NN downtown) (NN café)))) (, ,) (VP (VBG overhearing) (S (NP (NP (DT a) (NN bunch)) (PP (IN of) (NP (JJ typical) (NML (JJ late) (HYPH -) (CD twenty)) (HYPH -) (NNS somethings)))) (VP (NN natter) (PRT (IN on)) (NP (RB about) (NN nothing))))) (, ,) (CC and))))
(ROOT (S (VP (VP (VBG ) (PP (IN ) (NP (DT ) (NN ) (NN )))) (, ) (VP (VBG ) (S (NP (NP (DT ) (NN )) (PP (IN ) (NP (JJ ) (NML (JJ ) (HYPH ) (CD )) (HYPH ) (NNS )))) (VP (NN ) (PRT (IN )) (NP (RB ) (NN ))))) (, ) (CC ))))