( ( ( Water trees ) ( during ( ( dry periods ) ( since drought ) ) ) ) ( ( ( predisposes trees ) ( to ( canker ( ( development and ) expansion ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Water) (NNS trees)) (PP (IN during) (NP (NP (JJ dry) (NNS periods)) (PP (IN since) (NP (NN drought)))))) (VP (VBZ predisposes) (NP (NNS trees)) (PP (TO to) (NP (NN canker) (NN development) (CC and) (NN expansion)))) (. .)))
Water trees during dry periods since drought predisposes trees to canker development and expansion.
(ROOT (S (SBAR (IN Because) (S (NP (NNS trees)) (VP (VBP add) (NP (NN water) (NN vapor)) (PP (TO to) (NP (NN air)))))) (, ,) (S (VP (VBG cutting) (PRT (RP down)) (NP (NNS forests)))) (VP (VBZ leads) (PP (TO to) (NP (NP (JJR longer) (NNS periods)) (PP (IN of) (NP (NN drought)))))) (. .)))