A lot of people struggle with this, but they can learn to communicate more clearly and effectively. I recommend the short book:
How to Get Your Point Across in 30 Seconds or Less by Milo Frank
How to Get Your Point Across in 30 Seconds or Less by Milo Frank
Curiously, I'm finding myself quite distracted by the skits used to illustrate points. I was engaged for a few minutes before the dialogue started.