( ( An ( underwater earthquake ) ) ( ( can ( create ( ( an ( ( extremely large ) ( , ( long wave ) ) ) ) ( called ( a tsunami ) ) ) ) ) . ) )
(ROOT (S (NP (DT An) (JJ underwater) (NN earthquake)) (VP (MD can) (VP (VB create) (NP (NP (DT an) (ADJP (RB extremely) (JJ large)) (, ,) (JJ long) (NN wave)) (VP (VBN called) (NP (DT a) (NN tsunami)))))) (. .)))
An underwater earthquake can create an extremely large, long wave called a tsunami.
(ROOT (S (NP (DT A) (-LRB- -LRB-) (NN n) (-RRB- -RRB-) (NN underwater) (NN earthquake)) (VP (VBZ creates) (NP (DT a) (NN tsunami))) (. .)))