Suggest me an easy classic

I’ve made it a goal to challenge myself and therefore, every year, I wanna try to read at least one classic.

Whilst these books are good (duh, otherwise they wouldn’t have become a classic) I find them so challenging because of the language. English isn’t my native tounge but I also don’t wanna read translated versions, so alot of the time the writing and language is difficult because it’s an old book.

So, can someone here recommend me a classic with relatively easy language? Bonus if it’s short too, under 300 pages. Right now I’m reading Walden and while it’s very interesting I do struggle with it.