sentence1_binary_parse: ( ( ( ( ( ( The ( woolly mammoth ) ) ( ( went ( extinct ( in ( these parts ) ) ) ) ( ( ( about 10,000 ) years ) ago ) ) ) , ) but ) ( ( for ( ( those ( of us ) ) ( addicted ( to ( the ( need ( to ( ( ( search and ) search ) again ) ) ) ) ) ) ) ) ( , ( ( California frontiers ) ( remain ( as ( ( ( wild and ) woolly ) ( as ( they ( were ( when ( ( the ( first ( human explorers ) ) ) ( ( walked ( across ( the ( Bering straits ) ) ) ) ( to ( a ( New World ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . )
sentence1_parse: (ROOT (S (S (NP (DT The) (JJ woolly) (NN mammoth)) (VP (VBD went) (ADJP (JJ extinct) (PP (IN in) (NP (DT these) (NNS parts)))) (ADVP (NP (QP (RB about) (CD 10,000)) (NNS years)) (RB ago)))) (, ,) (CC but) (S (PP (IN for) (NP (NP (DT those)) (PP (IN of) (NP (PRP us))) (ADJP (VBN addicted) (PP (TO to) (NP (DT the) (NN need) (S (VP (TO to) (VP (VB search) (CC and) (VB search) (ADVP (RB again)))))))))) (, ,) (NP (NNP California) (NNS frontiers)) (VP (VBP remain) (ADJP (RB as) (JJ wild) (CC and) (JJ woolly) (SBAR (IN as) (S (NP (PRP they)) (VP (VBD were) (SBAR (WHADVP (WRB when)) (S (NP (DT the) (JJ first) (JJ human) (NN explorers)) (VP (VBD walked) (PP (IN across) (NP (DT the) (NNP Bering) (NNS straits))) (PP (TO to) (NP (DT a) (NNP New) (NNP World)))))))))))) (. .)))
sentence1: The woolly mammoth went extinct in these parts about 10,000 years ago, but for those of us addicted to the need to search and search again, California frontiers remain as wild and woolly as they were when the first human explorers walked across the Bering straits to a New World.
sentence2_parse: (ROOT (S (NP (JJ Woolly) (NNS mammoths)) (VP (VBD began) (S (VP (TO to) (VP (VB go) (NP (NP (ADJP (JJ extinct)) (NNS thousands)) (PP (IN of) (NP (NNS years)))) (ADVP (RB ago) (PP (IN because) (PP (IN of) (S (VP (VBG hunting) (PP (IN by) (NP (NNS humans)))))))))))) (. .)))
sentence2: Woolly mammoths began to go extinct thousands of years ago because of hunting by humans.