A SIM server provides {HEAD ~ access} to {TAIL ~ the SIMs}, a SIM librarian catalogs the SIMs, and a SIM accounting system tracks and/bills for SIM usage 
to
A SIM server provides { HEAD ~ access } to { TAIL ~ the SIMs } , a SIM librarian catalogs the SIMs , and a SIM accounting system tracks and / bills for SIM usage
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH