Complex sentence: Television coverage of the September 11 attacks and their aftermath was the longest and biggest uninterrupted news event in the history of U.S. television, as the major U.S. broadcast networks were on the air for 93 continuous hours.
Split into simpler sentences: Television coverage of the September 11 attacks and their aftermath was the longest uninterrupted news event in the history of U.S. television. The major U.S. broadcast networks were on the air for 93 continuous hours.