( ( Like ( ( a wave ) ( in water ) ) ) ( , ( ( all waves ) ( ( ( ( ( ( have ( ( ( high points ) and ) ( low points ) ) ) , ) ( called crests ) ) and ) troughs ) . ) ) ) )
(ROOT (S (PP (IN Like) (NP (NP (DT a) (NN wave)) (PP (IN in) (NP (NN water))))) (, ,) (NP (DT all) (NNS waves)) (VP (VP (VBP have) (NP (NP (JJ high) (NNS points)) (CC and) (NP (JJ low) (NNS points)))) (, ,) (VP (VBD called) (NP (NNS crests))) (CC and) (VP (VBZ troughs))) (. .)))
Like a wave in water, all waves have high points and low points, called crests and troughs.
(ROOT (S (NP (PRP You)) (VP (VBP call) (SBAR (S (NP (NP (DT the) (ADJP (JJ high) (CC and) (JJ low)) (NNS points)) (PP (IN of) (NP (JJ transverse) (NNS waves)))) (VP (VP (VBZ crests)) (CC and) (VP (VBZ troughs)))))) (. .)))