Notwithstanding the sons of Korah died not.
Notwithstanding the children of Korah died not.
But Korah's sons did not die.
Notwithstanding, the sons of Korah died not.
But Korah’s descendants didn’t die.
so that, when Korah perished, his sons did not perish.
That when Core perished, his sons did not perish.