To add in a sickness record in two parts without triggering the sickness triggers, you'll need to ensure the sickness is linked to a previous sickness by selecting This sickness is a continuation check box when prompted during adding the details for the second part of the sickness as a separate record.
📌Note: The end date of the first sickness needs to be within a few days of the start date of the second sickness record in order to be linked together.