Both of those are partly true but partly heresy.
Christianity Today
It was an amusing observation, and only partly true.
Times, Sunday Times
But it's true, nonetheless - or partly true, at least.
The Sun
That may be partly true but, overall, public libraries are not efficiently managed, and too often don't meet modern needs.
Times, Sunday Times
That's partly true, at least of my friends and me.
Times, Sunday Times