This is painfully true. I went to a US university after high school in France and had a really hard time adjusting to the American style of essays. So many paragraphs with sentences crossed off for being too long, in particular. Hitting word limits when, in a French dissertation, you'd just be getting started (an exaggeration, yes, but still).
It wasn't a "language" problem because I was already a fluent American English speaker. It was all style-related.
I've recently started reading 19th century French literature again and sometimes I have to reread sentences multiple times because they're so long I come to the wrong conclusion too early.
