To tweak

'To tweak' something is corporate-speak for basic editing or making other minor changes.

Example:
-This document needs to be tweaked before we can send it out.

He took another opportunity.

Saying that someone "took another opportunity" is a way of saying someone no longer works in a place. Since it is a vague response, there is no way to know if the person quit or was fired.

-Does Michael still work here?
-No, he took another opportunity.
-Oh, that's too bad! I really liked him!
-Yeah, we miss him, too.