( ( ( ( ( ( ( ( that ( most ocean ) ) and ) ( lake waves ) ) ( are ( caused ( by wind ) ) ) ) , ) but ) ( waves ( ( are also ) ( caused ( by earthquakes ) ) ) ) ) . )
(ROOT (S (S (NP (NP (DT that) (JJS most) (NN ocean)) (CC and) (NP (NN lake) (NNS waves))) (VP (VBP are) (VP (VBN caused) (PP (IN by) (NP (NN wind)))))) (, ,) (CC but) (S (NP (NNS waves)) (VP (VBP are) (ADVP (RB also)) (VP (VBN caused) (PP (IN by) (NP (NNS earthquakes)))))) (. .)))
that most ocean and lake waves are caused by wind, but waves are also caused by earthquakes.
(ROOT (S (NP (JJS Most) (NN ocean) (NNS waves)) (VP (VBP are) (VP (VBN caused) (PP (IN by) (NP (NN wind))))) (. .)))