( They ( ( ( are ( at ( ( that stage ) ( of childhood ) ) ) ) ( when ( they ( are ( hungry ( to learn ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (VBP are) (PP (IN at) (NP (NP (DT that) (NN stage)) (PP (IN of) (NP (NN childhood))))) (SBAR (WHADVP (WRB when)) (S (NP (PRP they)) (VP (VBP are) (ADJP (JJ hungry) (S (VP (TO to) (VP (VB learn))))))))) (. .)))
They are at that stage of childhood when they are hungry to learn.
(ROOT (S (NP (NNP Childhood)) (VP (VBZ is) (ADJP (ADJP (RB typically) (JJR easier)) (PP (IN for) (S (VP (VBG learning) (NP (JJ multiple) (NNS languages))))))) (. .)))