( That ( ( ( ( means ( ( ( two ( low tides ) ) and ) ( ( two ( high tides ) ) ( each day ) ) ) ) , ) ( not one ) ) . ) )
(ROOT (S (NP (DT That)) (VP (VBZ means) (NP (NP (CD two) (JJ low) (NNS tides)) (CC and) (NP (NP (CD two) (JJ high) (NNS tides)) (NP (DT each) (NN day)))) (, ,) (ADVP (RB not) (NP (CD one)))) (. .)))
That means two low tides and two high tides each day, not one.
(ROOT (S (NP (NP (CD Two) (NN low)) (CC and) (NP (JJ high) (NNS tides))) (VP (VBP occur) (PP (IN per) (NP (NN day)))) (. .)))