( ( ( The ( yellow swirls ) ) ( on ( ( the water ) ( of ( Crater Lake ) ) ) ) ) ( ( have ( ( become ( ( an ( annual sign ) ) ( of ( ( the arrival ) ( of spring ) ) ) ) ) ( in ( ( the ( Southern Cascades ) ) ( of Oregon ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (JJ yellow) (NNS swirls)) (PP (IN on) (NP (NP (DT the) (NN water)) (PP (IN of) (NP (NNP Crater) (NNP Lake)))))) (VP (VBP have) (VP (VBN become) (NP (NP (DT an) (JJ annual) (NN sign)) (PP (IN of) (NP (NP (DT the) (NN arrival)) (PP (IN of) (NP (NN spring)))))) (PP (IN in) (NP (NP (DT the) (NNP Southern) (NNP Cascades)) (PP (IN of) (NP (NNP Oregon))))))) (. .)))
The yellow swirls on the water of Crater Lake have become an annual sign of the arrival of spring in the Southern Cascades of Oregon.
(ROOT (S (NP (NNS Craters) (CC and) (NNS rifts)) (VP (VBP become) (NP (NNS lakes)) (SBAR (WHADVP (WRB when)) (S (NP (PRP they)) (VP (VBP fill) (PP (IN with) (NP (NN water))))))) (. .)))