Original sentence: In either case, Martin's influence in the party eventually forced Chrétien to announce his retirement and in December Martin took over.Martin claims that he was fired from cabinet by Chrétien, which is what was widely reported in the media, while Chrétien claims that Martin had resigned.What ensued is of some debate
Edited sentence: Martin was about to resign from Cabinet when Chrétien fired him.Martin's influence in the party forced Chrétien to announce his retirement, however, and in December Martin took over