( ( ( Water it ) ( during ( drought periods ) ) ) . )
(ROOT (S (VP (VB Water) (NP (PRP it)) (PP (IN during) (NP (NN drought) (NNS periods)))) (. .)))
Water it during drought periods.
(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)))))) (. .)))