Complex sentence: His peerage was controversial due to his status as tax exile, a Cabinet Office statement that he would take up permanent residence in the UK for tax purposes, and the revelation a decade later that he had not done so.
Split into simpler sentences: His peerage was controversial due to his status as tax exile. The Cabinet Office stated that he would take up permanent residence in the UK for tax purposes, however it was revealed a decade later that he had not done so.