{HEAD ~ A user} of the printer may need to know {TAIL ~ the status} of the mechanisms mentioned above and settings, that is, the status of the printer 
need to know
{ HEAD ~ A user } of the printer may need to know { TAIL ~ the status } of the mechanisms mentioned above and settings , that is , the status of the printer
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH