Should be able to do that in three sentances or so. Through your ability to present simply you will be able to communicate your command on your business and market.
So -- three paragprahs:
1. Your introduction and personal connection/link to them.
2. The P.S.O. (as above)
3. The ask (meeting, phone call, meet at the conference they are attending. . . . )
Remember these a busy people who will be scanning the letter not really reading it. They get hundreds of these. By keeping it short and simple you are respecting their time -- and maximizing the opportunity you will get a warm response when you follow up with a phone call.