And sometime during the third year, they can imagine objects and events with little or no support from the real world, as when they say to a play partner,  I'm calling Susie on the phone! 
( ( And ( sometime ( ( during ( the ( third year ) ) ) ( , ( they ( can ( ( ( imagine ( ( objects and ) events ) ) ( with ( ( little or ) ( no support ) ) ) ) ( from ( the ( real world ) ) ) ) ) ) ) ) ) ) ( , ( ( as ( ( when ( they ( say ( to ( a ( play partner ) ) ) ) ) ) ( , ( I ( 'm ( calling ( Susie ( on ( the phone ) ) ) ) ) ) ) ) ) ! ) ) )
(ROOT (FRAG (S (CC And) (ADVP (RB sometime)) (PP (IN during) (NP (DT the) (JJ third) (NN year))) (, ,) (NP (PRP they)) (VP (MD can) (VP (VB imagine) (NP (NNS objects) (CC and) (NNS events)) (PP (IN with) (NP (NP (RB little)) (CC or) (NP (DT no) (NN support)))) (PP (IN from) (NP (DT the) (JJ real) (NN world)))))) (, ,) (SBAR (IN as) (S (SBAR (WHADVP (WRB when)) (S (NP (PRP they)) (VP (VBP say) (PP (TO to) (NP (DT a) (NN play) (NN partner)))))) (, ,) (NP (PRP I)) (VP (VBP 'm) (VP (VBG calling) (NP (NP (NNP Susie)) (PP (IN on) (NP (DT the) (NN phone)))))))) (. !)))
Occasionally during the third year, they are able to imagine objects and events without support from the real world.
( ( Occasionally ( during ( the ( third year ) ) ) ) ( , ( they ( ( are ( able ( to ( ( ( imagine ( ( objects and ) events ) ) ( without support ) ) ( from ( the ( real world ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (ADVP (RB Occasionally)) (IN during) (NP (DT the) (JJ third) (NN year))) (, ,) (NP (PRP they)) (VP (VBP are) (ADJP (JJ able) (S (VP (TO to) (VP (VB imagine) (NP (NNS objects) (CC and) (NNS events)) (PP (IN without) (NP (NN support))) (PP (IN from) (NP (DT the) (JJ real) (NN world)))))))) (. .)))