This epic poem, dated into the 6th century, is one of the more antic evidencest famous and influential works of English literature.

Since the rest of your writing explains why Beowulf is so impactful, I think pointing out how Beowulf is famous and influential is more important than pointing out how it is old.

The word "evidence" is used more to refer to facts, objects or information to prove something.

It’s written in old English, a language highlystyle of English that is incomprehensible forto native speakers nowadays.

I would say that "old English" is English, it is just an antiquated form of English. So I think the word "style" is more appropriate here.

The poem is elegantly written resorting to, using a wide variety of literary devices, which makes the poem a piece ofwidely studyied to this day.

As for the theme of the epic, at first, it’s misleading because even though it is an English poem, the story has nothing to do with the English culture.

The definite article is not needed before the words "English culture" in this sentence.

Actually, the saga takes place in Denmark, and theits more than 3,000 lines encompasses not theonly English customs, but the nNordic world vision of the world at the time.

There is also a movie about Beowulf that had a grossingwas very successful.

The word "gross" can be used as an adjective or a verb. When used as a verb, it can sometimes be used as a substitute for "to earn". If you want to use the word "to gross" normally, you write the amount that the company or filmed earned. For example "Beowulf grossed $196.4 million at the box office."

Especially the soundtrack, which is quite epic and stimulatingpowerful.

In fact, when you listen toit its something happens in your bra inspiring that it makes you feel ready to face any challenge you have to face.

When you say "something happens in your brain", it has the sense that there is some kind of chemical change in your brain, which may not be true. It seems like it is more accurate to say that the soundtrack inspires you and temporarily changes your emotions.

For the movie, a computer program was usedSpecial effects were used for the movie.

When a computer or technology is made to edit the actors or settings of a movie, in English, we call them "special effects".

Therefore, even though real actors were hired to play the different roles, with the computer program, by using special effects, the engineers were able to modify the settings and also some of the physical features of the actors.

This was a little bit disappointing because, after watching the movie, I ran to look up the actor who played Beowulf, but to my dismay, the physical aspectfeatures of the actor wasere so altered for the role that it didn’t resemble the real person in the least.

"Physical features" is the expression normally used. "Physical aspects" is somewhat unnatural.

I assume the actor only lent his voice for the role because I couldn’t recognize anything of his physical feature of him ins when he played Beowulf.

This epic poem dated into the 6th century is one of the more anticcient pieces of evidence of English literature.

"evidence" is like "news", if you want to speak about a single one you need to say "a piece of".

The poem is elegantly written resorting to a wide variety of literary devices, which makes the poem a piece of studystudy topic to this day.

Especially the soundtrack which is quite epic and stimulatingpowerful.

"stimulating" sounds kind of weird in this context

In fact, when you listen to it something happens in your brain that makes you ready to face any challenge you have to face.

More coincise

I assume the actor only lent his voice for the role because I couldn’t recognize anything physical feature of him in Beowulf.