( ( The class ) ( ( has ( been ( divided ( into ( ( seven groups ) ( for ( the exhibition ) ) ) ) ) ) ) ; ) )
(ROOT (S (NP (DT The) (NN class)) (VP (VBZ has) (VP (VBN been) (VP (VBN divided) (PP (IN into) (NP (NP (CD seven) (NNS groups)) (PP (IN for) (NP (DT the) (NN exhibition)))))))) (: ;)))
The class has been divided into seven groups for the exhibition;
(ROOT (S (NP (NNS Mollusks)) (VP (MD can) (VP (VB be) (VP (VBN divided) (PP (IN into) (NP (CD seven) (NNS classes)))))) (. .)))
Mollusks can be divided into seven classes.