Complex sentence: On August 28th Chris Mortensen claimed on a Radio Station that the Patriots have apologized to him, a claim that Robert Kraft, Jonathan Kraft and the Patriots organization reject stating that they have nothing to apologize to him for.
Split into simpler sentences: On August 28th Chris Mortensen claimed on a Radio Station that Robert and Jonathan Kraft have apologized to him. Mortensen's claim in this regard has been rejected by Robert Kraft, Jonathan Kraft and the Patriots organization, who have stated that they have nothing to apologize to him for.