( ( The burls ) ( ( ( ( ( take ( a ( long time ) ) ) ( to ( ( grow , ) ( they ( ( do n't ) ( kill ( the trees ) ) ) ) ) ) ) and ) so ) are ) )
(ROOT (S (NP (DT The) (NNS burls)) (VP (VP (VBP take) (NP (DT a) (JJ long) (NN time)) (S (VP (TO to) (VP (VB grow) (, ,) (SBAR (S (NP (PRP they)) (VP (VBP do) (RB n't) (VP (VB kill) (NP (DT the) (NNS trees)))))))))) (CC and) (ADVP (RB so)) (VP (VBP are)))))
The burls take a long time to grow, they don't kill the trees and so are
(ROOT (S (NP (NP (DT An) (NN acorn)) (VP (VBG growing) (PP (IN into) (NP (DT an) (JJ adult) (NN tree))))) (VP (MD will) (VP (VB take) (NP (DT the) (JJS longest) (NN time)) (S (VP (TO to) (VP (VB observe)))))) (. .)))