In france, legal texts are written in "everyday" French, although the legal vocabulary may not be known to non-specialists.
However, for some reason (tradition, I guess), court judgements are to be written in ONE sentence, even if it is several pages-long (that is changing: in particular administrative law judgements no longer follow that since 2019).
Get ready for hundreds or thousands of commas (and semi-colons) with as many subordinates propositions (https://en.wikipedia.org/wiki/French_grammar#Cleft_sentences) when reading them.