Complex sentence: In September 2003 he took up the Drivetime slot on London news & talk station LBC 97.3 until the end of 2004, when a new year reshuffle saw some of the station's most experienced presenters such as Brian Hayes and Angela Rippon not have their contracts renewed.
Split into simpler sentences: In September 2003 he took up the Drivetime slot on London news & talk station LBC 97.3. At the end of the year, in a new year reshuffle Kelly and some of the station's most experienced presenters such as Brian Hayes and Angela Rippon did not have their contracts renewed.