claims to sort the bad guys from the good , which is its essential problem . 
(ROOT (S (VP (VBZ claims) (S (VP (VP (TO to) (VP (VB sort) (NP (DT the) (JJ bad) (NNS guys)) (PP (IN from) (NP (DT the) (NN good))))) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (NP (PRP$ its) (JJ essential) (NN problem)))))))) (. .)))
(ROOT (S (VP (VBZ ) (S (VP (VP (TO ) (VP (VB ) (NP (DT ) (JJ ) (NNS )) (PP (IN ) (NP (DT ) (NN ))))) (, ) (SBAR (WHNP (WDT )) (S (VP (VBZ ) (NP (PRP$ ) (JJ ) (NN )))))))) (. )))