( ( An example ) ( ( is ( ( ( the ( Crab pulsar ) ) , ) ( which ( is ( ( ( ( slowing ( its spin ) ) ( at ( ( a rate ) ( of ( ( 38 nanoseconds ) ( per day ) ) ) ) ) ) , ) ( ( releasing ( enough energy ) ) ( to ( power ( the ( Crab nebula ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT An) (NN example)) (VP (VBZ is) (NP (NP (DT the) (NNP Crab) (NN pulsar)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (VP (VBG slowing) (NP (PRP$ its) (NN spin)) (PP (IN at) (NP (NP (DT a) (NN rate)) (PP (IN of) (NP (NP (CD 38) (NNS nanoseconds)) (PP (IN per) (NP (NN day))))))) (, ,) (S (VP (VBG releasing) (NP (JJ enough) (NN energy)) (PP (TO to) (NP (NP (NN power)) (NP (DT the) (NNP Crab) (NN nebula)))))))))))) (. .)))
An example is the Crab pulsar, which is slowing its spin at a rate of 38 nanoseconds per day , releasing enough energy to power the Crab nebula.
(ROOT (S (NP (NP (DT The) (NN rate)) (SBAR (IN that) (S (NP (NN energy)) (VP (VBZ is) (VP (VBN released)))))) (VP (VBZ is) (VP (VBN known) (PP (IN as) (NP (NN power))))) (. .)))