( ( a tsunami ) ( ( is ( ( a ( massive wave ) ) ( caused ( by ( ( an ( underwater ( earthquake ( tidewater ( tikka masala ) ) ) ) ) ( times ( ( 1am , ) ( 6.30 ( pm etc ) ) ) ) ) ) ) ) ) ; ) )
(ROOT (S (NP (DT a) (NN tsunami)) (VP (VBZ is) (NP (NP (DT a) (JJ massive) (NN wave)) (VP (VBN caused) (PP (IN by) (NP (NP (DT an) (JJ underwater) (NN earthquake) (NN tidewater) (NN tikka) (NN masala)) (PP (CC times) (NP (NP (NNS 1am)) (, ,) (NP (CD 6.30) (NN pm) (NN etc))))))))) (: ;)))
a tsunami is a massive wave caused by an underwater earthquake tidewater tikka masala times 1am, 6.30pm etc;
(ROOT (S (NP (DT A) (-LRB- -LRB-) (NN n) (-RRB- -RRB-) (NN underwater) (NN earthquake)) (VP (VBZ creates) (NP (DT a) (NN tsunami))) (. .)))