So not ROT13. If original was: "The my program Mobara TV Pro Llandrwyd" – Mobara TV Pro: Possibly a made-up brand or a video capture device from an obscure Chinese or Japanese OEM. Searching "Mobara TV Pro" yields no results, but "Mobara" alone is a Japanese city. There is a company "Mobara" making capacitors, not TV products.
If brnamj → try reversing: jmanrb – no. thmyl → thmyl – in Welsh, y is vowel, so thmyl could be a mutation of tyfyl ? No. Apply ROT13 (Caesar shift 13):
llandrwyd → yy naq jlq – nonsense.
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