( ( ( Normal galaxies ) ( -LRB- ( ( ( ( ( that is ) , ) not ) ( active galaxies ) ) -RRB- ) ) ) ( ( can ( be ( classified ( into ( three ( morphological types ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (JJ Normal) (NNS galaxies)) (PRN (-LRB- -LRB-) (NP (NP (NP (DT that)) (VP (VBZ is))) (, ,) (RB not) (NP (JJ active) (NNS galaxies))) (-RRB- -RRB-))) (VP (MD can) (VP (VB be) (VP (VBN classified) (PP (IN into) (NP (CD three) (JJ morphological) (NNS types)))))) (. .)))
Normal galaxies (that is, not active galaxies) can be classified into three morphological types.
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (CD three) (NNS types)) (PP (IN of) (NP (NNS galaxies))))) (. .)))