Una otra oración...
"Yo te acepté sabiendo que no habías logrado olvidarla."
I'm just confused at the end. "I accepted you knowing that you hadn't achieved to forget it."
2 Answers
"Una oración demás" or "otra oración". We can´t use "una" and "otra" together; it would be the same as using double articles.
Depending on context, "la" could also mean "her"