That's a valid point. Perhaps I am.
[After a moment, he adds,]
My father was a Magister. He wanted to change things for the better. When I got sick, he was driven mad trying to find a cure.
Other options:
no subject
That's a valid point. Perhaps I am.
[After a moment, he adds,]
My father was a Magister. He wanted to change things for the better. When I got sick, he was driven mad trying to find a cure.