Tnzyl Brnamj Fy By An Mjany -

Actually, ROT13 on “brnamj”: b→o, r→e, n→a, a→n, m→z, j→w → “oe anzw” no. Maybe each word is reversed? “tnzyl” reversed = “lyznt” no.

"gamyl oeanwj sl ol na zwnal" doesn’t make sense. tnzyl brnamj fy by an mjany

Alternatively, maybe it’s just a known phrase scrambled for fun. Actually, ROT13 on “brnamj”: b→o, r→e, n→a, a→n,