However, since the concentration of the polar vinyl compound is low, the pressure crystallization must be performed at {HEAD ~ further lower temperatures}, thereby bringing about {TAIL ~ a further decrease} in separation efficiency 
bringing about
However , since the concentration of the polar vinyl compound is low , the pressure crystallization must be performed at { HEAD ~ further lower temperatures } , thereby bringing about { TAIL ~ a further decrease } in separation efficiency
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH