Complex sentence: John Doyle is a professional announcer whose voice was most notably used by the National Institute of Standards and Technology on their radio clock WWV, a "time and temperature" voice for the Audichron Company.
Split into simpler sentences: John Doyle is a professional announcer whose voice was used by, amongst others, the National Institute of Standards and Technology on their radio clock WWV. He was also a "time and temperature" voice for the Audichron Company.