Wiktionary
adv. (context idiomatic English) In a pure and simple manner.
Usage examples of "purely and simply".
But the truth of the matter was that purely and simply he had already given up.
Falconsbane was mad, purely and simply, but Ma'ar was as close to sane as anyone of his ilk is ever likely to be.
I think he had some idea about using that to upset the balance between the two magnetic fields, purely and simply to get back at me, but he's never actually got around to doing anything about it yet.
He is, purely and simply, a treasure-hunter and there's no one in the business who can hold a candle to him.
My concern was not for the warmth and comfort of the passengers, or even for the cooking of the food - we had little enough of that, heaven knew, though a constant supply of warm water would come in useful for dealing with the inevitable cases of frostbite - but purely and simply for the life of Theodore Mahler.