It has been shown that {TAIL ~ this additional forward movement} influences very favorably {HEAD ~ the quality} of the loosening layer 
It has been shown that { TAIL ~ this additional forward movement } influences very favorably { HEAD ~ the quality } of the loosening layer
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH