Between ages 3 and 4, this detachment of make-believe symbols from the real-life conditions they stand for is well developed.
( ( Between ( ( ( ages 3 ) and ) 4 ) ) ( , ( ( ( this detachment ) ( of ( ( make-believe symbols ) ( from ( ( the ( real-life conditions ) ) ( they ( stand for ) ) ) ) ) ) ) ( ( is ( well developed ) ) . ) ) ) )
(ROOT (S (PP (IN Between) (NP (NNS ages) (CD 3) (CC and) (CD 4))) (, ,) (NP (NP (DT this) (NN detachment)) (PP (IN of) (NP (NP (JJ make-believe) (NNS symbols)) (PP (IN from) (NP (NP (DT the) (JJ real-life) (NNS conditions)) (SBAR (S (NP (PRP they)) (VP (VBP stand) (PP (IN for)))))))))) (VP (VBZ is) (ADJP (RB well) (JJ developed))) (. .)))
Children prefer to get into real-life situations. 
( Children ( ( prefer ( to ( get ( into ( real-life situations ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Children)) (VP (VBP prefer) (S (VP (TO to) (VP (VB get) (PP (IN into) (NP (JJ real-life) (NNS situations))))))) (. .)))