The method 1 where {HEAD ~ said forcing step} is simultaneously performed on {TAIL ~ two sets} of profiles attached to said film 
is simultaneously performed on
The method 1 where { HEAD ~ said forcing step } is simultaneously performed on { TAIL ~ two sets } of profiles attached to said film
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH