( ( Surface waves ) ( ( are ( classified ( into ( ( ( ( ( two ( basic types ) ) , ) ( Rayleigh waves ) ) and ) ( Love waves ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Surface) (NNS waves)) (VP (VBP are) (VP (VBN classified) (PP (IN into) (NP (NP (CD two) (JJ basic) (NNS types)) (, ,) (NP (JJ Rayleigh) (NNS waves)) (CC and) (NP (NN Love) (NNS waves)))))) (. .)))
Surface waves are classified into two basic types, Rayleigh waves and Love waves.
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (CD two) (NNS types)) (PP (IN of) (NP (NN surface) (NNS waves))))) (. .)))