( Tides ( ( ( are mostly ) ( caused ( by ( ( the ( gravitational pull ) ) ( of ( ( ( the Moon ) , ) ( which ( ( ( pulls ( on ( ( the water ) ( in ( the oceans ) ) ) ) ) ... ) ( as ( the ( Earth rotates ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Tides)) (VP (VBP are) (ADVP (RB mostly)) (VP (VBN caused) (PP (IN by) (NP (NP (DT the) (JJ gravitational) (NN pull)) (PP (IN of) (NP (NP (DT the) (NN Moon)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ pulls) (PP (IN on) (NP (NP (DT the) (NN water)) (PP (IN in) (NP (DT the) (NNS oceans))))) (: ...) (PP (IN as) (NP (DT the) (NNP Earth) (NNS rotates)))))))))))) (. .)))
Tides are mostly caused by the gravitational pull of the Moon, which pulls on the water in the oceans… as the Earth rotates.
(ROOT (S (NP (NP (JJS Most)) (PP (IN of) (NP (NP (NN earth) (POS 's)) (NN water)))) (VP (VBZ is) (VP (VBN located) (PP (IN in) (NP (NNS oceans)))))))