If we simply emphasize the retirement of the chairman, then I personally suggest choosing the angle of the chairman's affectionate farewell as a guide to lead to when the chairman will retire. In the text of this news, we pay attention to the performance of the chairman during his tenure and the evaluation of the chairman's work. In the final conclusion, you can use the blessing and expectation of the chairman to the company or the goodwill of ordinary employees to the chairman as the conclusion.
My humble opinion, please consider it and hope it will help you.