( ( ( ( ( ( At ( that time ) ) ( there ( was ( a ( great drought ) ) ) ) ) , ) and ) ( Shan-wu-wei ( was ( ordered ( to ( conduct ( prayers ( for rain ) ) ) ) ) ) ) ) . )
(ROOT (S (S (PP (IN At) (NP (DT that) (NN time))) (NP (EX there)) (VP (VBD was) (NP (DT a) (JJ great) (NN drought)))) (, ,) (CC and) (S (NP (NNP Shan-wu-wei)) (VP (VBD was) (VP (VBN ordered) (S (VP (TO to) (VP (VB conduct) (NP (NP (NNS prayers)) (PP (IN for) (NP (NN rain)))))))))) (. .)))
At that time there was a great drought, and Shan-wu-wei was ordered to conduct prayers for rain.
(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)))))))))))) (. .)))