( ( ( ( At least ) five ) ( major ( mass ( extinction events ) ) ) ) ( ( have ( occurred ( during ( ( the history ) ( of ( ( ( ( life ( on Earth ) ) , ) ( as ( well as ) ) ) ( numerous ( minor ones ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (QP (IN At) (JJS least) (CD five)) (JJ major) (JJ mass) (NN extinction) (NNS events)) (VP (VBP have) (VP (VBN occurred) (PP (IN during) (NP (NP (DT the) (NN history)) (PP (IN of) (NP (NP (NP (NN life)) (PP (IN on) (NP (NNP Earth)))) (, ,) (CONJP (RB as) (RB well) (IN as)) (NP (JJ numerous) (JJ minor) (NNS ones)))))))) (. .)))
At least five major mass extinction events have occurred during the history of life on Earth, as well as numerous minor ones.
(ROOT (S (NP (CD Five) (JJ mass) (NNS distinctions)) (VP (VBP have) (ADVP (RB radically)) (VP (VBN altered) (NP (NP (DT the) (NN history)) (PP (IN of) (NP (NN life)))))) (. .)))