I'm more surprised, that it was actually comprehensible.

He's a lawyer!

Doesn't that make it even more surprising?

Try German, I hear sentences can go on for pages and pages.

They can, but it's gone out of fashion since Mark Twain's times. If you really want to, I recommend Kant.

It's Bloomsday on Saturday - the last two sentences in Ulysses are 11,282 and 12,931 words long, respectively.

That's only because there's no punctuation. The sentences end, sort of, but the full stops have been omitted.

Try some of Plato's works, not pages, but certainly very long sentences.

HHOS