When you have finished writing your article make sure that you proof read it at least twice, then set it aside for a day or two, so that you can go over it again when you are in a different frame of mind. That way you can view it as though you were the reader and this can help you to get a better prospective.
If you would like a second opinion ask a family or friend to read through it and see if they suggest any changes. There are also services that will proof read your articles for you. Try doing a search for “article proofreading service” and you will find several.