《Tom和Mary離開了。》《這是的從前的故事。》

[ignosticism]

The Chinese is not correct, both parts. Maybe: 《Tom和Mary分手了。》《這是從前的故事。》 or 《Tom離開Mary了。》《這是從前的故事。》

[Zacharias]

I agree again, although it will depend on the translation
The sentences as they are don’t make sense and are grammatically wrong.