{HEAD ~ The VRO} then calculates {TAIL ~ optimized control commands} for various network devices including the controllable taps of voltage regulating transformers 
calculates
{ HEAD ~ The VRO } then calculates { TAIL ~ optimized control commands } for various network devices including the controllable taps of voltage regulating transformers
HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH