( ( ( A campaign ) ( in ( ( the ( United Kingdom ) ) ( aimed ( to ( prevent ( ( the commencing ) ( of ( ( a ( controversial method ) ) ( of ( ( shale ( gas extraction ) ) ( known ( as fracking ) ) ) ) ) ) ) ) ) ) ) ) ) ( ( have ( ( ( organised themselves ) ( under ( the ( name Frack ) ) ) ) Off ) ) . ) )
(ROOT (S (NP (NP (DT A) (NN campaign)) (PP (IN in) (NP (NP (DT the) (NNP United) (NNP Kingdom)) (VP (VBN aimed) (S (VP (TO to) (VP (VB prevent) (NP (NP (DT the) (NN commencing)) (PP (IN of) (NP (NP (DT a) (JJ controversial) (NN method)) (PP (IN of) (NP (NP (JJ shale) (NN gas) (NN extraction)) (VP (VBN known) (PP (IN as) (NP (NN fracking)))))))))))))))) (VP (VBP have) (VP (VBN organised) (NP (PRP themselves)) (PP (IN under) (NP (DT the) (NN name) (NN Frack))) (ADVP (IN Off)))) (. .)))
A campaign in the United Kingdom aimed to prevent the commencing of a controversial method of shale gas extraction known as fracking have organised themselves under the name Frack Off.
(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.