What about Piaget's belief that through make-believe, young children solidify their new symbolic capacity?
( ( What ( about ( ( Piaget 's ) belief ) ) ) ( ( ( that ( through ( make-believe ( , ( young children ) ) ) ) ) ( solidify ( their ( new ( symbolic capacity ) ) ) ) ) ? ) )
(ROOT (SBARQ (WHNP (WHNP (WP What)) (PP (IN about) (NP (NP (NNP Piaget) (POS 's)) (NN belief)))) (SQ (VP (ADVP (RB that) (PP (IN through) (NP (JJ make-believe) (, ,) (JJ young) (NNS children)))) (VBP solidify) (NP (PRP$ their) (JJ new) (JJ symbolic) (NN capacity)))) (. ?)))
Piaget's theories on childhood fantasies has been documented in many books.
( ( ( ( Piaget 's ) theories ) ( on ( childhood fantasies ) ) ) ( ( has ( been ( documented ( in ( many books ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NP (NNP Piaget) (POS 's)) (NNS theories)) (PP (IN on) (NP (NN childhood) (NNS fantasies)))) (VP (VBZ has) (VP (VBN been) (VP (VBN documented) (PP (IN in) (NP (JJ many) (NNS books)))))) (. .)))