( ( The ( Triassic-Jurassic ( extinction event ) ) ) ( ( ( ( began ( during ( this epoch ) ) ) and ) ( is ( one ( of ( ( the ( five ( major ( mass ( extinction events ) ) ) ) ) ( of ( the Earth ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNP Triassic-Jurassic) (NN extinction) (NN event)) (VP (VP (VBD began) (PP (IN during) (NP (DT this) (NN epoch)))) (CC and) (VP (VBZ is) (NP (NP (CD one)) (PP (IN of) (NP (NP (DT the) (CD five) (JJ major) (NN mass) (NN extinction) (NNS events)) (PP (IN of) (NP (DT the) (NN Earth)))))))) (. .)))
The Triassic-Jurassic extinction event began during this epoch and is one of the five major mass extinction events of the Earth.
(ROOT (S (NP (EX There)) (VP (VBP have) (VP (VBN been) (NP (CD five) (JJ major) (JJ massive) (NNS extinctions)) (SBAR (IN since) (S (NP (NN life)) (VP (VBD began) (PP (IN on) (NP (NN earth)))))))) (. .)))