The projectors and {HEAD ~ the cameras} may be electronically connected to {TAIL ~ a computer processor} which controls their operation 
electronically connected to
The projectors and { HEAD ~ the cameras } may be electronically connected to { TAIL ~ a computer processor } which controls their operation
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH