( Punctuated ( ( equilibrium ( vs gradualism ) ) ( in ( macroevolution I. ) ) ) )
(ROOT (S (VP (VB Punctuated) (NP (NP (NN equilibrium) (NN vs) (NN gradualism)) (PP (IN in) (NP (NN macroevolution) (NN I.)))))))
Punctuated equilibrium vs gradualism in macroevolution I.
(ROOT (S (NP (NNP Darwin)) (VP (VBD believed) (PP (IN in) (NP (NN gradualism)))) (. .)))