( ( ( The ( gravitational pull ) ) ( of ( the ( ( Moon and ) Sun ) ) ) ) ( ( give ( ( ( ( ( ( rise ( to ( two ( high tides ) ) ) ) and ) ( ( two ( low tides ) ) ( every ( lunar day ) ) ) ) , ) or ) ( ( ( every ( 24 hours ) ) and ) ( 50 minutes ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (JJ gravitational) (NN pull)) (PP (IN of) (NP (DT the) (NNP Moon) (CC and) (NNP Sun)))) (VP (VBP give) (NP (NP (NP (NN rise)) (PP (TO to) (NP (CD two) (JJ high) (NNS tides)))) (CC and) (NP (NP (CD two) (JJ low) (NNS tides)) (NP (DT every) (JJ lunar) (NN day))) (, ,) (CC or) (NP (NP (DT every) (CD 24) (NNS hours)) (CC and) (NP (CD 50) (NNS minutes))))) (. .)))
The gravitational pull of the Moon and Sun give rise to two high tides and two low tides every lunar day, or every 24 hours and 50 minutes.
(ROOT (S (NP (NP (CD Two) (NN low)) (CC and) (NP (JJ high) (NNS tides))) (VP (VBP occur) (PP (IN per) (NP (NN day)))) (. .)))