These undergo a natural course of development through direct contact with the environment during the first two years of life, similar to the process of exploration and discovery described by Piaget.
( These ( ( ( ( ( ( undergo ( ( a ( natural course ) ) ( of development ) ) ) ( through ( ( direct contact ) ( with ( the environment ) ) ) ) ) ( during ( ( the ( first ( two years ) ) ) ( of life ) ) ) ) , ) ( similar ( to ( ( ( the process ) ( of ( ( exploration and ) discovery ) ) ) ( described ( by Piaget ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT These)) (VP (VBP undergo) (NP (NP (DT a) (JJ natural) (NN course)) (PP (IN of) (NP (NN development)))) (PP (IN through) (NP (NP (JJ direct) (NN contact)) (PP (IN with) (NP (DT the) (NN environment))))) (PP (IN during) (NP (NP (DT the) (JJ first) (CD two) (NNS years)) (PP (IN of) (NP (NN life))))) (, ,) (ADJP (JJ similar) (PP (TO to) (NP (NP (DT the) (NN process)) (PP (IN of) (NP (NN exploration) (CC and) (NN discovery))) (VP (VBN described) (PP (IN by) (NP (NNP Piaget)))))))) (. .)))
Piaget has never described any developments processes before.
( Piaget ( ( ( has never ) ( described ( ( any developments ) ( processes before ) ) ) ) . ) )
(ROOT (S (NP (NNP Piaget)) (VP (VBZ has) (ADVP (RB never)) (VP (VBN described) (SBAR (S (NP (DT any) (NNS developments)) (VP (VBZ processes) (ADVP (RB before))))))) (. .)))