Application of {HEAD ~ outside forces}, such as caused by tilling, rainstorms, irrigation, etc., insures complete breakdown of {TAIL ~ these granules} 
Application of { HEAD ~ outside forces } , such as caused by tilling , rainstorms , irrigation , etc . , insures complete breakdown of { TAIL ~ these granules }
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL