I want to hide contracts when employee is turned to inactive.

My Scenario:

1. I have more than 1 contract of current as well past employees. (I save the search of "end date is not set" which gives me all current contracts).
2. And I want the details of past employee's contracts (if I do it with "end date is set" then it will show old contracts of current employee as well).
3. Also there are few past employee whose end date is not entered.

so how can I show contracts of past employee separately ? OR how can I hide contracts of past employee whose contract end date is not entered?