Can you identify many other characters individually? (I was wondering whether the main difficulty is deciphering the actual characters or making sense of the meaning once the characters are known.)
Personally, I can't even tell it's Japanese and not Chinese...
I can decipher few kanji indivisually, but it's useless to understand the meaning. If I can read all kanji, I might be able to get the gist of it.
It's 漢文, i.e., sentences written in (classical) Chinese grammar, I think.