Likewise from German there's not a direct translation for Backpfeifengesicht, a 'face that is asking to be slapped', more literally 'face slap face'. Is there a more Englishy way to say Zeitgeist that captures the same meaning? You could replace it with "spirit of the time", but it feels a bit too general and clumsy. Is there a succinct English equivalent to Schadenfreude that isn't too long or clumsy?

Many social constructs don't translate well. The word "freunde" is much, much stronger than "friends", for example. "We're all friends here" doesn't really work in German, at least not in the same situations. Similarly, English doesn't really have a term for "Wohnunggemeinschaft."

Puns often don't translate, which breaks translating many of the jokes in Shakespeare, for example. Going from German to English, the Rammstein song "Du has(s)t much" doesn't translate due to the puns, as does much of the writing by Yoko Tawada.

Gender ambiguous things don't always translate either. The gender neutral pronoun "they" translates to "sie" in German, which is the same as the pronoun "she" but with different verb conjugations. "Trans man" or "transwoman" are usually translated in German the same as "man" or "woman". Nuance on racial issues also doesn't always translate smoothly between the two languages.

I am sure there are many, many more.

100 Years of Solitude is an absolute masterpiece. It's very difficult to put a finger on exactly why, but all agree there is a tone to it and to the way he tells the story, which usually people call "magical realism". The way it's so inexorably connected to a South American place and time, it's gonna be a different thing if you read it in English (credit though to the translators who do this incredibly difficult job in a stunning manner). The musicality and mood of the speech, for lack of a better description, cannot be accurately rendered in English.

In short, it's more nuanced than "what's a sentence I can say in English that I can't say in German".