{HEAD ~ The signals} received by tuners are processed respectively by {TAIL ~ video processing circuits} and fed to a synthesizing circuit by way of compression circuits so that the images of the signals are displayed respectively on left and right side sections of the screen of a display unit 
are processed respectively by
{ HEAD ~ The signals } received by tuners are processed respectively by { TAIL ~ video processing circuits } and fed to a synthesizing circuit by way of compression circuits so that the images of the signals are displayed respectively on left and right side sections of the screen of a display unit
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL REL REL TAIL 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH