( ( Since ( ( the ( Raso lark ) ) ( is ( ( ( confined ( to ( a ( small ( islands-Cape ( Verde Islands ) ) ) ) ) ) , ) ( during ( times ( of ( drought ( and ( little rain ) ) ) ) ) ) ) ) ) ) ( , ( they ( ( survive ( by ( ( ( gathering and ) eating ) ( ( subterranean bulbs ) ( of ( the nutsedges ) ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN Since) (S (NP (DT the) (NNP Raso) (NN lark)) (VP (VBZ is) (VP (VBN confined) (PP (TO to) (NP (DT a) (JJ small) (NN islands-Cape) (NNP Verde) (NNP Islands))) (, ,) (PP (IN during) (NP (NP (NNS times)) (PP (IN of) (NP (NN drought) (CC and) (JJ little) (NN rain))))))))) (, ,) (NP (PRP they)) (VP (VBP survive) (PP (IN by) (S (VP (VBG gathering) (CC and) (VBG eating) (NP (NP (JJ subterranean) (NNS bulbs)) (PP (IN of) (NP (DT the) (NNS nutsedges)))))))) (. .)))
Since the Raso lark is confined to a small islands-Cape Verde Islands, during times of drought and little rain, they survive by gathering and eating subterranean bulbs of the nutsedges.
(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)))))))))))) (. .)))