I also need to maintain the structure of the original sentences as much as possible. If a phrase is a title or a compound term (like "720P"), I should leave those as they are. The user mentioned skipping proper nouns, so names like "Hachimitsu Private Magical Arts High School" should stay the same.
So for the current text:
So they broke down "Download" into synonyms, "Prison School Behind the Walls" into other titles (but proper nouns are skipped). Wait, but the user now says "skip proper nouns," which are names like "Prison School," "Behind the Walls," etc. So in this case, "Prison School Behind the Walls" is a proper noun title and should be skipped. Download Prison School Behind the Walls -UC HD 720P Hentai