How would you explain two short job tenures without becoming defensive?

The sample is an explicitly fictional applicant: one role was a three-month seasonal contract that ended as agreed; another lasted four months and ended when a required course timetable conflicted with the work schedule. The applicant gave the agreed notice and completed a handover. Their current availability is documented for the coming term. Use only facts that match your own history. If you have no short tenures, explain how you would discuss an actual transition rather than claim these events happened to you.