Can you correct please?

Dear Jo,

Yesterday I went to see a film at the UCI CINEMA in Florence, that it is one of the biggest multi-screen cinemas in my town. I saw “SULLA MIA PELLE”, a film about a news report of from some years ago, in which the protagonist is killed by the police. It was an amazing and dramatic film.

Would you like to see a film next week?

Let me know.

See you soon, (Usually, you would put a comma after [See you soon,] only IF you used one when you addressed the person you are speaking to [Dear Jo,]. Otherwise, you can choose to leave out the comma in both locations but just remember it should be kept consistent throughout the communication.) 

Tommaso

can you correct please?

Dear Jo,

Yesterday I went to see a film at UCI CINEMA in Florence, that which is one of the biggest multi-screen cinemas in my town. I saw “SULLA MIA PELLE”, a film about a news report of from some years ago, in which the protagonist is killed by the police. It was an amazing and dramatic film.
After a comma, you HAVE TO use "which".
"I like this book, WHICH was written by my favorite author."

If there isn't a comma, "which" and "that" are both OK, but "that" is better.
OK: I like books WHICH were written by my favorite author.
BETTER: I like books THAT were written by my favorite author.
Would you like to see a film next week?

Let me know.

See you soon

Tommaso