Complex sentence: Ampex company demonstrates a videotape recorder at the 1956 NARTB (now National Association of Broadcasters) convention in Chicago, Illinois, using the first practical and commercially successful videotape format known as 2 Quadruplex.
Split into simpler sentences: Ampex company demonstrates a videotape recorder at the 1956 NARTB (now National Association of Broadcasters) convention in Chicago, Illinois. It was the demonstration of the first practical and commercially successful videotape format known as 2 Quadruplex.