Complex sentence: Since leaving office he has had charges of misrule made against him by his successor, Ibrahim Idris, though the ousted gov. Ibrahim Idris and EFFC are yet to substantiate their claims against Audu.
Split into simpler sentences: Since leaving office he has had charges of misrule made against him by his successor, Ibrahim Idris. The ousted governor Ibrahim Idris and the Economic and Financial Crimes Commission have yet to substantiate their claims against Audu.