( ( Some roots ) ( ( can ( grow ( ( as deep ) ( as ( ( the tree ) ( is high ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT Some) (NNS roots)) (VP (MD can) (VP (VB grow) (ADVP (ADVP (RB as) (JJ deep)) (SBAR (IN as) (S (NP (DT the) (NN tree)) (VP (VBZ is) (ADJP (JJ high)))))))) (. .)))
Some roots can grow as deep as the tree is high.
(ROOT (S (NP (JJ Deep) (NNS roots)) (VP (MD will) (ADVP (RBS best)) (VP (VB prevent) (NP (DT a) (NN tree)) (PP (IN from) (S (VP (VBG being) (VP (VBN blown) (PRT (RP over)) (PP (IN by) (NP (JJ high) (NNS winds))) (PP (IN during) (NP (DT a) (NN storm))))))))) (. .)))
Deep roots will best prevent a tree from being blown over by high winds during a storm.