but that

conjunction4

1. •
   (literary) Following not so, an elaboration of that.

   • […]the present is not so glorious but that I should not wish to dwell a little in the past. — 1905
2. •
   (literary, no longer used) Except that.

   • After the master of the house found there was no remedy, but that he, his wife, and his children were to be locked up with this poor distempered servant[…] — 1722
3. •
   (literary, no longer used) Were it not that.

   • He would be wholly a Christian, but that he is something of an atheist, and wholly an atheist, but that he is partly a Christian; and a perfect heretic, but that there are so many to distract him. — 1628
4. •
   (literary, no longer used) So that.

   • For God sent not his Son into the world to condemn the world; but that the world through him might be saved. — 1611