By no means an easy task for a lawyer.
“To condense the diffused light of a page of thought into the luminous flash of a single sentence is worthy to rank as a prize composition just by itself”
Mark Twain.
Do not lose heart. Keep trying, on the eight try, you just might succeed.
Brevity however, does not mean being peremptory. A strategic legal document is meant to speak for itself. You can’t afford to give an impression to the judge that you failed to state you position with clarity thereby forcing your adversary into litigation. You would need to strike a balance in your strategy depending on several factors. (see subsequent paragraphs).