Original: In late 1978 a placard containing instructions on how to lower the aft stairs of a 727, later confirmed to be from the rear stairway of the plane from which Cooper jumped, was found just a few flying minutes north of Cooper's projected drop zone.
Simplified: In late 1978, a placard, which contained instructions on how to lower the rear stairs of a 727 was found just a few flying minutes north of Cooper's projected drop zone.