( ( In ( ( one year ) ( of ( operation ( of ( a ( nuclear reactor ) ) ) ) ) ) ) ( , ( ( ( long-lived ( fission products ) ) ( that ( have ( been manufactured ) ) ) ) ( ( ( will not ) ( have ( decayed significantly ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (NP (CD one) (NN year)) (PP (IN of) (NP (NP (NN operation)) (PP (IN of) (NP (DT a) (JJ nuclear) (NN reactor))))))) (, ,) (NP (NP (JJ long-lived) (NN fission) (NNS products)) (SBAR (WHNP (WDT that)) (S (VP (VBP have) (VP (VBN been) (VP (VBN manufactured))))))) (VP (MD will) (RB not) (VP (VB have) (VP (VBN decayed) (ADVP (RB significantly))))) (. .)))
In one year of operation of a nuclear reactor, long-lived fission products that have been manufactured will not have decayed significantly.
(ROOT (S (NP (DT The) (JJ long-lived) (NNS isotopes)) (VP (VBP require) (NP (NP (NNS thousands)) (PP (IN of) (NP (NP (NNS years)) (PP (TO to) (NP (NN decay)))))) (PP (TO to) (NP (NP (DT a) (JJ safe) (NN level)) (PP (IN in) (NP (DT a) (JJ nuclear) (NN reactor)))))) (. .)))