I am a native English speaker from the USA. I teach English in Thailand -- especially writing, academic writing, and business English. I regularly do writing, proofreading, editing, and paraphrasing of documents locally for non-native English speakers. So, a project like this is very familiar to me. You can see examples of my writing, proofreading, and editing work under my Freelancer profile. Also, my profile shows high scores on several English skills tests from Freelancer as well as excellent reviews.
I have recently done writing for two websites.