If they had used the government-approved process, the material would have passed through a measuring cylinder that would have limited the amount to well below the danger level.
(they; had used; the government-approved process) (the material; would have passed; through a measuring cylinder) (a measuring cylinder; would have limited; the amount; to well below the danger level)
they the material a measuring cylinder
had used would have passed would have limited
the government-approved process
through a measuring cylinder
the amount to well below the danger level