( There ( ( are ( ( two groups ) ( of ( ( earthquake waves ) ( called ( body ( waves ( and ( surface waves ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (CD two) (NNS groups)) (PP (IN of) (NP (NP (NN earthquake) (NNS waves)) (VP (VBN called) (NP (NN body) (NNS waves) (CC and) (NN surface) (NNS waves))))))) (. .)))
There are two groups of earthquake waves called body waves and surface waves .
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (CD two) (NNS types)) (PP (IN of) (NP (NN surface) (NNS waves))))) (. .)))