Complex sentence: On the day of the resignation a report from the Ombudsman was still pending, Ombudsman started his investigation when he learned of communication between the Minister and the Chief of Police regarding the investigation of the leak.
Split into simpler sentences: On the day of the resignation a report from the Ombudsman was still pending. The Ombudsman started his investigation when he learned of communication between the Minister and the Chief of Police regarding the investigation of the leak.