( ( With ( ( ( the discovery ) ( of ( ( ( Near ( Earth Asteroids ) ) and ) asteroids ) ) ) ( that ( have ( the ( potential ( to ( collide ( with ( the Earth ) ) ) ) ) ) ) ) ) ) ( , ( suddenly ( people ( ( are ( beginning ( to ( realise ( that ( these ( are ( things ( we ( should study ) ) ) ) ) ) ) ) ) ) . ) ) ) ) )
(ROOT (S (PP (IN With) (NP (NP (DT the) (NN discovery)) (PP (IN of) (NP (NP (NNP Near) (NNP Earth) (NNP Asteroids)) (CC and) (NP (NNS asteroids)))) (SBAR (WHNP (WDT that)) (S (VP (VBP have) (NP (DT the) (NN potential) (S (VP (TO to) (VP (VB collide) (PP (IN with) (NP (DT the) (NN Earth)))))))))))) (, ,) (ADVP (RB suddenly)) (NP (NNS people)) (VP (VBP are) (VP (VBG beginning) (S (VP (TO to) (VP (VB realise) (SBAR (IN that) (S (NP (DT these)) (VP (VBP are) (NP (NP (NNS things)) (SBAR (S (NP (PRP we)) (VP (MD should) (VP (VB study)))))))))))))) (. .)))
With the discovery of Near Earth Asteroids and asteroids that have the potential to collide with the Earth, suddenly people are beginning to realise that these are things we should study.
(ROOT (S (PP (IN In) (NP (DT the) (NN past))) (, ,) (NP (NP (NNS asteroids)) (VP (VBG colliding) (PP (IN with) (NP (NN planet) (NN earth))))) (VP (VBZ has) (VP (VBN caused) (NP (JJ many) (NNS organisms)) (S (VP (TO to) (VP (VB die) (PRT (RP off))))))) (. .)))