Complex sentence: The station went on the air for the first time on July 10,1930 as WIS. On January 23,1930, WIS was the last U.S. broadcast station to be assigned a previously unused call sign with three letters instead of four.
Split into simpler sentences: The station went on the air for the first time on July 10,1930. Its first the call letters were WIS. On January 23,1930, WIS was the last U.S. broadcast station to be assigned a previously unused call sign with three letters instead of four.