( He ( ( thought ( that ( ( small ( gradual changes ) ) ( ( could not ) ( bridge ( ( the ( hypothetical divide ) ) ( between ( ( microevolution and ) macroevolution ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP He)) (VP (VBD thought) (SBAR (IN that) (S (NP (JJ small) (JJ gradual) (NNS changes)) (VP (MD could) (RB not) (VP (VB bridge) (NP (NP (DT the) (JJ hypothetical) (NN divide)) (PP (IN between) (NP (NN microevolution) (CC and) (NN macroevolution))))))))) (. .)))
He thought that small gradual changes could not bridge the hypothetical divide between microevolution and macroevolution.
(ROOT (S (NP (NNP Microevolution)) (VP (VBZ is) (NP (NP (DT the) (NN process)) (SBAR (WHPP (IN by) (WHNP (WDT which))) (S (NP (NNS organisms)) (VP (VBP change) (PP (IN in) (NP (NP (JJ small) (NNS ways)) (PP (IN over) (NP (NN time)))))))))) (. .)))