Original sentence: Warren finally had enough and resigned-coincidentally right before the murder of Mary Jane Kelly on 9 November 1888.Warren's resignation hindered the investigation
Edited sentence: It was also true, however, that Sir James Monro, who resigned because of a dispute with Warren just before the murders began, was kept at Scotland Yard so that the inspectors involved in the investigation, could report to him rather than Warrren and was appointed Commissioner when Warren resigned Warren's resignation hindered the investigation.Warren finally had enough and resigned - perhaps coincidentally - just before the murder of Mary Jane Kelly on 9 November 1888