( Asbestos ( is ( more ( like ( ( a class ) ( of ( substances ( which ( can be ) ) ) ) ) ) ) ) )
(ROOT (S (NP (NN Asbestos)) (VP (VBZ is) (ADJP (ADJP (JJR more)) (PP (IN like) (NP (NP (DT a) (NN class)) (PP (IN of) (NP (NP (NNS substances)) (SBAR (WHNP (WDT which)) (S (VP (MD can) (VP (VB be)))))))))))))
Asbestos is more like a class of substances which can be
(ROOT (S (NP (DT A) (NN mineral)) (VP (VBZ is) (VP (VBN described) (PP (IN as) (NP (NP (DT a) (JJ natural) (NN substance)) (SBAR (WHNP (WDT that)) (S (VP (VBZ makes) (PRT (RP up)) (NP (NNS rocks))))))))) (. .)))