( ( If ( chromosomes ( ( ( are not ) properly ) ( ( attached ( to ( the ( mitotic spindle ) ) ) ) ( by ( ( the time ) ( of ( this checkpoint ) ) ) ) ) ) ) ) ( , ( ( ( the onset ) ( of anaphase ) ) ( ( will ( be delayed ) ) . ) ) ) )
(ROOT (S (SBAR (IN If) (S (NP (NNS chromosomes)) (VP (VBP are) (RB not) (ADVP (RB properly)) (VP (VBN attached) (PP (TO to) (NP (DT the) (JJ mitotic) (NN spindle))) (PP (IN by) (NP (NP (DT the) (NN time)) (PP (IN of) (NP (DT this) (NN checkpoint))))))))) (, ,) (NP (NP (DT the) (NN onset)) (PP (IN of) (NP (NN anaphase)))) (VP (MD will) (VP (VB be) (VP (VBN delayed)))) (. .)))
If chromosomes are not properly attached to the mitotic spindle by the time of this checkpoint, the onset of anaphase will be delayed.
(ROOT (S (NP (JJ Spindle) (NNS fibers)) (VP (VBP pull) (NP (VBN linked) (NNS chromosomes)) (PP (ADVP (RB apart)) (IN in) (NP (JJ anaphase) (NN i.))))))