However, this leads to the problem of higher system installation time and costs and {HEAD ~ larger space requirements} of {TAIL ~ overall system} 
of
However , this leads to the problem of higher system installation time and costs and { HEAD ~ larger space requirements } of { TAIL ~ overall system }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL