( ( A ( polar cell ) ) ( ( is ( ( a system ) ( of ( winds ( that ( influence ( ( the climate ) ( of ( the Cordillera ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT A) (JJ polar) (NN cell)) (VP (VBZ is) (NP (NP (DT a) (NN system)) (PP (IN of) (NP (NP (NNS winds)) (SBAR (WHNP (WDT that)) (S (VP (VBP influence) (NP (NP (DT the) (NN climate)) (PP (IN of) (NP (DT the) (NNP Cordillera))))))))))) (. .)))
A polar cell is a system of winds that influence the climate of the Cordillera.
(ROOT (S (NP (VBG Prevailing) (NNS winds)) (VP (VBP influence) (NP (NN climate))) (. .)))