Gōngchǎng bìxū zài sān ge yuè nèi wánchéng zhěnggǎi.
The factory must complete the rectification within three months.
Tips
usage
An official word, common in government notices: 限期整改 'rectify by a deadline', 停业整改 'close for rectification'. 整顿 is a broader shake-up of a whole organization; 整改 fixes the particular problems that were found.