The sampled portions of {HEAD ~ the analog video signal} are provided to {TAIL ~ a multiplexer} and then passed sequentially through the multiplexer 
The sampled portions of { HEAD ~ the analog video signal } are provided to { TAIL ~ a multiplexer } and then passed sequentially through the multiplexer
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH