Always choose the simpler word when writing employee newsletter articles. Forget using the word "conundrum" to describe a big problem. Instead use "a big problem". You must draw a balance between writing how people speak, but ridding yourself of slang, contractions, and inappropriate grammar, etc., even if people do speak that way. And don't count on free employee newsletter articles available on the internet to always use the simpler word. It takes practice.
You may have employee newsletter ideas that really excite you. That's great. But realize that the more emotionally involved you are with the article, the more likely it is that you will write quickly and your mind will speed your thoughts up causing you to produce your employee newsletter too fast. It is easy skip sentences that should be included to help the reader grasp the full meaning of your article. So try to make sentences short, not long-winded. And think "process" as you connect one thought to the next.
As you write for your audience, realize a very important point: Your reader must interpret what you are saying one word at a time. They are reading what you wrote for understanding. You should therefore do the same thing. Be careful not to write for your own personal reasons. These might include impressing your reader, saying something profound, being angry, making a splash, getting something off your chest.
You can write for any of these reasons, but always put them second to the goal of writing for understanding. Did you know that the New York Times writes for a reader who has a ninth grade education? Keep this in mind and do the same, and employee newsletters that you write, will be completely read--and passed along to others.