( but ( , ( it ( ( can ( be ( in ( three dimensions ) ) ) ) . ) ) ) )
(ROOT (S (CC but) (, ,) (NP (PRP it)) (VP (MD can) (VP (VB be) (PP (IN in) (NP (CD three) (NNS dimensions))))) (. .)))
but, it can be in three dimensions.
(ROOT (S (NP (NNS Humans)) (VP (MD can) (VP (VB see) (PP (IN in) (NP (CD three) (NNS dimensions))))) (. .)))