( ( During Anaphase ) ( , ( ( ( ( ( homologues separate ) , ) not ) ( ( their sister ) chromatids ) ) . ) ) )
(ROOT (S (PP (IN During) (NP (NNP Anaphase))) (, ,) (S (NP (NNS homologues)) (VP (VBP separate))) (, ,) (RB not) (S (NP (PRP$ their) (NN sister)) (VP (VBZ chromatids))) (. .)))
During Anaphase, homologues separate, not their sister chromatids.
(ROOT (S (PP (IN During) (NP (DT the) (JJ anaphase) (NN phase))) (, ,) (S (NP (NN sister) (NNS chromatids)) (VP (VBP separate))) (CC and) (S (NP (DT the) (NNS centromeres)) (VP (VBP divide))) (. .)))