( ( From ( ( naturally occurring ) substances ) ) ( , ( ( ( ( rubber , ) and ) wood ) ( ( are ( ( good examples ) ( of insulators ) ) ) . ) ) ) )
(ROOT (S (PP (IN From) (NP (ADJP (RB naturally) (VBG occurring)) (NNS substances))) (, ,) (NP (NP (NN rubber)) (, ,) (CC and) (NP (NN wood))) (VP (VBP are) (NP (NP (JJ good) (NNS examples)) (PP (IN of) (NP (NNS insulators))))) (. .)))
From naturally occurring substances, rubber, and wood are good examples of insulators.
(ROOT (S (NP (NNP Wood) (NNP burning)) (VP (VBZ is) (NP (NP (DT an) (NN example)) (PP (IN of) (NP (NP (DT a) (JJ different) (NN substance)) (VP (VBG being) (VP (VBN formed))))))) (. .)))