Using short sentences makes the author sound rude. using run-on sentences makes the author seem super talkative. I suggest use medium length sentences to set the tone.
If a star is small, it will remain in the main sequence longer than a large star.
I was at lunch with my mother and we were discussing current events. We had placed our order about five minutes earlier. Just as we were beginning to become irritated our drinks were brought to us. My mother ordered a soda pop, where as I had ordered an iced tea. My tea was served with a slice of bitter lemon. After drinks, we had a wonderful lunch.
