What is the Sharia ruling regarding a husband who divorced his wife after disputes and demands, and then she refused to take possession of her remaining personal belongings, accusing him of injustice? And is the husband considered sinful in this case?

You must return all of the woman's recorded and unrecorded possessions, because fulfilling a trust is obligatory. You must also ask her to retrieve any remaining furniture and clothing she owns to clear your responsibility, or for her to absolve you of her right to them willingly. These are a trust with you, and you are not obligated to send them to her, but if you volunteer to do so, it is good.