Parents seemed unable to distinguish  good  from  substandard  care.
( Parents ( ( seemed ( unable ( to ( ( distinguish good ) ( from ( substandard care ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Parents)) (VP (VBD seemed) (ADJP (JJ unable) (S (VP (TO to) (VP (VB distinguish) (ADJP (JJ good)) (PP (IN from) (NP (JJ substandard) (NN care)))))))) (. .)))
There seemed to be an inability to distinguish good from substandard care among parents.
( There ( ( seemed ( to ( be ( an ( inability ( to ( ( distinguish ( good ( from ( substandard care ) ) ) ) ( among parents ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (EX There)) (VP (VBD seemed) (S (VP (TO to) (VP (VB be) (NP (DT an) (NN inability) (S (VP (TO to) (VP (VB distinguish) (ADJP (JJ good) (PP (IN from) (NP (JJ substandard) (NN care)))) (PP (IN among) (NP (NNS parents))))))))))) (. .)))