Complex sentence: White and Ward currently co-present on Dave Gorman's Sunday morning show on Absolute Radio, where White has a regular slot performing an improvised song, covering as many of the topics discussed on that week's show as possible.
Split into simpler sentences: White and Ward currently co-present on Dave Gorman's Sunday morning show on Absolute Radio. Martin's main role on the Absolute Sunday Morning Show is to compose a song, covering as many of the topics discussed as possible.