This looks like a coded or scrambled phrase. Let me try to interpret it first.
Atbash of thmyl : t(20) ↔ g(7) h(8) ↔ s(19) m(13) ↔ n(14) y(25) ↔ b(2) l(12) ↔ o(15) thmyl brnamj adwby rydr 9 rby mjana
But brnamj Atbash = yimznq , reversed = qnzmiy (no). Maybe thmyl = smith ? Let's check letter distances: s→t(+1), m→h(-5), i→m(+4), t→y(+5), h→l(+4) – not consistent. Given the puzzle nature, and rydr 9 likely means "Rider #9" — a common sports jersey number — thmyl could be an anagram of mythl or thylm — possibly "Smith" if shifted oddly. brnamj anagram of barnjm or jambrn . adwby anagram of byadw ? Possibly by daw ? mjana = jaman (like "Jaman"). But if I take a step back: the phrase might be a scrambled version of a famous sentence like: This looks like a coded or scrambled phrase
thmyl on QWERTY: t→r? no. Not fitting. Maybe thmyl = smith