More than a decade ago, I had an email address that I stopped using for a while, and when I finally went back to it, I had forgotten the password. When I had originally set it up, I had not assigned it any secondary email or other feature for retrieving forgotten passwords, so there was no way to get back to it and eventually I had to give up.
(Thst That)
(anything like that, just before I found Answerbag.)
Instead of beginning a new sentence, this is the second clause of the sentence that was already started.