( it ( ( is ( ( the ( principal current ) ) ( ( moving ( oceanic waters ) ) ( ( ( into and ) out ) ( of ( the gulf ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP it)) (VP (VBZ is) (NP (NP (DT the) (JJ principal) (NN current)) (VP (VBG moving) (NP (JJ oceanic) (NNS waters)) (PP (IN into) (CC and) (IN out) (PP (IN of) (NP (DT the) (NN gulf))))))) (. .)))
it is the principal current moving oceanic waters into and out of the gulf.
(ROOT (S (NP (DT A) (NN current)) (VP (VBZ is) (NP (NP (DT a) (NN stream)) (PP (IN of) (S (VP (VBG moving) (NP (NP (NN water)) (SBAR (WHNP (WDT that)) (S (VP (VBZ flows) (PP (IN through) (NP (DT the) (NN ocean)))))))))))) (. .)))