The new paper insert machine fills {HEAD ~ a gap} that has existed in the insert machine business for {TAIL ~ a number} of years 
existed for
The new paper insert machine fills { HEAD ~ a gap } that has existed in the insert machine business for { TAIL ~ a number } of years
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH