Complex sentence: In 1929, he had his own half-hour radio program heard Wednesday nights on the NBC Red Network at 10:30, however competition from Paul Whiteman's show on CBS Radio brought the show to an end by March 1930.
Split into simpler sentences: In 1929, he had his own half-hour radio program heard Wednesday nights on the NBC Red Network at 10:30. Competition from Paul Whiteman's show on CBS Radio, however, brought Gibbons' show to an end by March 1930.