This was always my worst subject. Can you please check the changes I made? Thank you very much for your time.

For the past three months, work-related problems have occurred in the office and need to be addressed. Before Jessica Hilo’s medical leave, the workload was equally divided. There were no problems with the quality or amount of work being given, and there were no overtime expenses. Jack Snyder, a full-time assistant, works for Jessica and Ralph Alane. Ruth Disselkoen, a part-time assistant, works for Samuel Daley and Frank Daley. Because of Jessica’s absence her work has temporarily been assigned to Ralph and Frank. As a result, the workload is no longer equally divided. Lately I have noticed that Jack has less work to do, been tardy a few times, and takes longer breaks then permitted. However, the work that he does have is professionally done, as before. Ruth has been working overtime to maintain the workload, costing the company $200 each month. She clearly shows signs of being overtired and overworked, causing her quality of work to be less than satisfactory. We need to confront these issues to save on overtime costs and distribute the workload equally.

Since were not sure if or when Jessica is returning to work, we need to modify Jack and Ruth’s workload temporarily. My suggestion would be for Jack and Ruth to exchange jobs for the time being. This would equally distribute the workload, cut the overtime, increase job performance, and minimize stress. We should implement this plan for at least three weeks. By then, we should have an idea if Jessica is returning to work, and then we can determine if we need to replace her or to continue with this arrangement.

Add a comma after "Because of Jessica's absence"

Add "has" before "been tardy a few times"

"Since were not sure" = ??

Everything else looks good.