( ( The material ) ( ( ( must then ) ( be ( ( burned , ) ( ( ( ( ( releasing pollutants ) ( into ( the air ) ) ) , ) and ) ( requiring ( ( the disposal ) ( of ( ( the ( resulting ash ) ) ( in ( a landfill ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN material)) (VP (MD must) (RB then) (VP (VB be) (VP (VBN burned) (, ,) (S (VP (VP (VBG releasing) (NP (NNS pollutants)) (PP (IN into) (NP (DT the) (NN air)))) (, ,) (CC and) (VP (VBG requiring) (NP (NP (DT the) (NN disposal)) (PP (IN of) (NP (NP (DT the) (VBG resulting) (NN ash)) (PP (IN in) (NP (DT a) (NN landfill)))))))))))) (. .)))
The material must then be burned, releasing pollutants into the air, and requiring the disposal of the resulting ash in a landfill.
(ROOT (S (NP (NP (NNP Ash)) (SBAR (WHNP (WDT that)) (S (VP (VBZ enters) (NP (DT the) (NN air)) (PP (ADVP (RB naturally)) (IN as) (NP (NP (DT a) (NN result)) (PP (IN of) (NP (DT a) (NN volcano) (NN eruption))))))))) (VP (VBZ is) (VP (VBN classified) (PP (IN as) (NP (DT a) (JJ primary) (NN pollutant))))) (. .)))