Briefly, {HEAD ~ the invention} is in {TAIL ~ the field} of decomposing halogenated organic compounds 
is in
Briefly , { HEAD ~ the invention } is in { TAIL ~ the field } of decomposing halogenated organic compounds
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH