There’s an excellent list of resources on Plain Language and the Law at PLAIN (Plain Language Association International).
One of the best articles is LEGAL WRITING 201: 30 SUGGESTIONS TO IMPROVE READABILITY (OR, HOW TO WRITE FOR JUDGES, NOT LIKE JUDGES)
Read it here: https://www.plainlanguagenetwork.org/Legal/legalwriting.pdf
Setting aside the debate as to whether the use of “plain” or “simpler” language can advance/protect your client’s position as effectively as dense legalese, these 30 suggestions will absolutely improve your writing — which will improve your relationships with your clients and the courts in front of whom you practice.
Here’s the full list of articles from PLAIN: https://www.plainlanguagenetwork.org/Legal/