( He ( ( ( was not ) ( ( based ( on ( the ( conditioned reflexes ) ) ) ) ( to ( explain ( human behavior ) ) ) ) ) . ) )
(ROOT (S (NP (PRP He)) (VP (VBD was) (RB not) (VP (VBN based) (PP (IN on) (NP (DT the) (JJ conditioned) (NNS reflexes))) (S (VP (TO to) (VP (VB explain) (NP (JJ human) (NN behavior))))))) (. .)))
He was not based on the conditioned reflexes to explain human behavior.
(ROOT (S (NP (NNP Reflex) (NNS behaviors)) (VP (VBP are) (NP (NP (DT the) (RB only) (JJ innate) (NNS behaviors)) (PP (IN in) (NP (NNS humans))))) (. .)))