( They ( ( can ( survive ( ( long periods ) ( of ( drought ( -LRB- ( ( ( a lack ) ( of water ) ) -RRB- ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (MD can) (VP (VB survive) (NP (NP (JJ long) (NNS periods)) (PP (IN of) (NP (NP (NN drought)) (PRN (-LRB- -LRB-) (NP (NP (DT a) (NN lack)) (PP (IN of) (NP (NN water)))) (-RRB- -RRB-))))))) (. .)))
They can survive long periods of drought (a lack of water).
(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)))))) (. .)))