( ( Refractions ( in ( ( the waves ) ( caused ( by ( the reef ) ) ) ) ) ) ( sometimes ( ( make ( for ( a ( ( ( slow but ) interesting ) ride ) ) ) ) . ) ) )
(ROOT (S (NP (NP (NNS Refractions)) (PP (IN in) (NP (NP (DT the) (NNS waves)) (VP (VBN caused) (PP (IN by) (NP (DT the) (NN reef))))))) (ADVP (RB sometimes)) (VP (VBP make) (PP (IN for) (NP (DT a) (ADJP (JJ slow) (CC but) (JJ interesting)) (NN ride)))) (. .)))
Refractions in the waves caused by the reef sometimes make for a slow but interesting ride.
(ROOT (S (NP (VBG Slowing)) (ADVP (RB down)) (VP (VBZ causes) (ADJP (JJ light) (S (VP (TO to) (VP (VB refract)))))) (. .)))