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)))))))) (. .)))
These go through a natural course of development similar to Piaget's description.
( These ( ( go ( through ( ( a ( natural course ) ) ( of ( development ( similar ( to ( ( Piaget 's ) description ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT These)) (VP (VBP go) (PP (IN through) (NP (NP (DT a) (JJ natural) (NN course)) (PP (IN of) (NP (NP (NN development)) (ADJP (JJ similar) (PP (TO to) (NP (NP (NNP Piaget) (POS 's)) (NN description))))))))) (. .)))