( ( A drought ) ( ( is ( ( ( a ( long period ) ) ( of time ) ) ( when ( there ( is ( little ( to ( ( no rain ) ( in ( our environment ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT A) (NN drought)) (VP (VBZ is) (NP (NP (DT a) (JJ long) (NN period)) (PP (IN of) (NP (NN time))) (SBAR (WHADVP (WRB when)) (S (NP (EX there)) (VP (VBZ is) (ADJP (JJ little) (PP (TO to) (NP (NP (DT no) (NN rain)) (PP (IN in) (NP (PRP$ our) (NN environment))))))))))) (. .)))
A drought is a long period of time when there is little to no rain in our environment.
(ROOT (S (NP (NNS Droughts)) (VP (VBZ occurs) (SBAR (WHADVP (WRB when)) (S (NP (EX there)) (VP (VBZ is) (ADJP (JJ little) (PP (TO to) (NP (NP (DT no) (NN rain)) (PP (IN in) (NP (NP (DT a) (NN period)) (PP (IN of) (NP (NN time)))))))))))) (. .)))