for this sort of thing to work , we need agile performers , 
(ROOT (S (SBAR (IN for) (S (NP (NP (DT this) (NN sort)) (PP (IN of) (NP (NN thing)))) (VP (TO to) (VP (VB work))))) (, ,) (NP (PRP we)) (VP (VBP need) (NP (JJ agile) (NNS performers))) (, ,)))
(ROOT (S (SBAR (IN ) (S (NP (NP (DT ) (NN )) (PP (IN ) (NP (NN )))) (VP (TO ) (VP (VB ))))) (, ) (NP (PRP )) (VP (VBP ) (NP (JJ ) (NNS ))) (, )))