After five years' decay time these wastes are no longer radioactive and can be disposed of in landfills.
(these wastes; are; T:no longer; radioactive; T:After five years' decay time) (these wastes; can be disposed; T:After five years' decay time)
these wastes these wastes
are can be disposed
T:no longer radioactive T:After five years' decay time
T:After five years' decay time