Complex sentence: Cowger's radio talk show began on December 5,2010, originally streaming digitally on BlogTalkRadio, until September 25,2011, when it switched to Spreaker Web Radio.
Split into simpler sentences: Cowger's radio talk show began on December 5,2010. It originally began streaming digitally on BlogTalkRadio, until September 25,2011, when it switched to Spreaker Web Radio.