If it’s a simple Caesar shift (A→B, etc.) or Atbash (A↔Z, B↔Y), test a small part: “nwdz” → in Atbash (n↔m, w↔d, d↔w, z↔a) = mdwa, not English.
QWERTY row shift: n→b, w→e, d→c, z→a → “beca…” → maybe “because my …”? Trying full phrase would be long but possible. If you provide context (was this a text from a friend? a puzzle? typed by accident on a phone?), I can give a more precise decoding. Otherwise, start by checking your keyboard language setting and try typing the same keys in English mode. nwdz mhjbh msryh hay klas btl trd js...
If this is a cipher or a keyboard-shift typo, here’s a quick guide to decode possible meanings: If it’s a simple Caesar shift (A→B, etc