Complex sentence: The AN/UCC-4, or UCC-4, was a solid state frequency division multiplexer manufactured by Lenkurt in 1969, and used by the United States Air Force to provide voice frequency communication to the Department of Defense.
Split into simpler sentences: The AN/UCC-4, or UCC-4, was a solid state frequency division multiplexer manufactured by Lenkurt in 1969. It was used by the United States Air Force to provide voice frequency communication to the Department of Defense.