I would appreciate it if somebody could help me with my English grammar. I am so confused about the usage of the past perfect. For example, when I read "on the last day of the month in which," I immediately begin to think about the past perfect because there appears to be two different reference points in the past.
But is it grammatical to use the past perfect in this example? We do not know exactly when the employee left the company.
The employee's insurance coverage terminated on the last day of the month in which he had already left the company.