People are often ‘operationally blind’ to their own texts. Most people are strongly focused on the content: Is everything I’m writing factually correct? Have I processed all the important information? Is my line of argument clear? It’s easy to lose sight of the language. The four-eyes principle is helpful here: Have a second person look over the text. With a fresh, neutral eye, they will probably notice completely different things than the writer would have expected. Just remember that even the works of famous writers are proofread by an editor!
Are you still dissatisfied with the quality of the text produced in-house? Have texts corrected, smoothed and improved by an external professional. You won’t have to pay a cent for their training and further education. Your permanent staff can then take care of other things. This is often more cost-effective and also leads to better results than having your employees attend further training courses and seminars with uncertain prospects of success.
If you regularly want to publish highly technical texts that are difficult for a non-specialist writer to familiarise themselves with, you can also choose the following model: Let the subject matter expert write the text. Release them from the demands of textual quality –– they should only share their knowledge in a structured way. A good writer can turn this raw material (possibly in collaboration and consultation with the original author) into an easily readable and correctly written text.