( ( In 2011 ) ( , ( Crownover ( ( coauthored ( ( ( House ( Bill 3328 ) ) , ) ( which ( required ( ( natural ( gas ( drilling operators ) ) ) ( ( engaged ( in ( hydraulic fracturing ) ) ) ( to ( disclose ( ( the chemicals ) ( used ( in ( the ( fracking process ) ) ) ) ) ) ) ) ) ) ) ) ) ; ) ) ) )
(ROOT (S (PP (IN In) (NP (CD 2011))) (, ,) (NP (NNP Crownover)) (VP (VBD coauthored) (NP (NP (NNP House) (NNP Bill) (NNP 3328)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBD required) (SBAR (S (NP (JJ natural) (NN gas) (NN drilling) (NNS operators)) (VP (VBD engaged) (PP (IN in) (NP (JJ hydraulic) (NN fracturing))) (S (VP (TO to) (VP (VB disclose) (NP (NP (DT the) (NNS chemicals)) (VP (VBN used) (PP (IN in) (NP (DT the) (VBG fracking) (NN process)))))))))))))))) (: ;)))
In 2011, Crownover coauthored House Bill 3328, which required natural gas drilling operators engaged in hydraulic fracturing to disclose the chemicals used in the fracking process;
(ROOT (S (NP (NNP Fracking)) (VP (VBZ delivers) (NP (JJ natural) (NN gas)) (PP (IN from) (NP (NP (NN rock)) (SBAR (WHNP (WDT that)) (S (VP (MD might) (RB not) (ADVP (RB otherwise)) (VP (VB be) (ADJP (JJ obtainable))))))))) (. .)))
Fracking delivers natural gas from rock that might not otherwise be obtainable.