You have several ways of changing a passive construction to an active one. The first and most common method is to place the doer before the action. Examples:
Passive: Pratash was rewarded by Microsoft for his exceptional service.
Active: Microsoft rewarded Pratash for his exceptional service.
Passive: Jason was called during the night. (Here the doer is hidden.)
Active: Jason’s manager called him during the night. (The doer is now revealed.)