What did my lawyer mean when he wrote:?

Plaintiff ___ prays that this honorable court enter judgment in his favor and against Defendant ___. for such damages are fair and reasonable, including double the unpaid difference between the amounts paid to Plaintiff ___ and the amounts required to be...

paid to him, and attorney's fees and costs, all in an amount over $25,000.00, and for such additional relief as may be just and proper under the circumstances.

Your lawyer is saying that whoever you're suing would pay double whatever you're asking for in addition to court costs and anything additional the court deems appropriate.

Basically, he's asking the judge to order payment to the plaintiff for double what was owed (the unpaid difference), plus his own lawyer fees and court costs which add up to more than $25, 000, as well as any other monetary amount that should be paid to the plaintiff as the judge deems fair according to the circumstances.