Editors often think good writing comes naturally - on the contrary, writing is a learned skill and requires constant practice. Good writers write, rewrite and rewrite again. Good writing reflects a personal style. It must be as simple and direct as speaking. Read aloud some of your own writing.
Readers are impatient.
Your job is to get information to the readers before they get your newsletter to the wastebasket. Keep sentences, paragraphs and stories short. Just as with your newsletter as a whole, each story, paragraph and even sentence should have a purpose. These goals will help you keep readers in mind so your words don't stray from the effect you want. The answer is your lead paragraph.