( Finally ( , ( ( in ( sympatric speciation ) ) ( species ( ( ( diverge ( without ( geographic ( ( isolation or ) changes ) ) ) ) ( in habitat ) ) . ) ) ) ) )
(ROOT (S (ADVP (RB Finally)) (, ,) (PP (IN in) (NP (JJ sympatric) (NN speciation))) (NP (NNS species)) (VP (VBD diverge) (PP (IN without) (NP (JJ geographic) (NN isolation) (CC or) (NNS changes))) (PP (IN in) (NP (NN habitat)))) (. .)))
Finally, in sympatric speciation species diverge without geographic isolation or changes in habitat.
(ROOT (S (NP (JJ Sympatric) (NN speciation)) (VP (VBZ is) (SBAR (WHADVP (WRB when)) (S (NP (DT a) (JJ new) (NN species)) (VP (VBZ arises) (PP (IN without) (NP (JJ geographic) (NN separation))))))) (. .)))