Written subpar paper needs revising to be solid hand in paper

No research required. Paper was done by another writer that used British English (not her native language) instead of U.S. English and I didn't know until too late. She tried hard but the paper does not flow. It needs revising to pass U.S. English college level standards for an essay. There's 6 written pages. (&1 works cited that needs no work). The assignment was for a fictitious company centered around a social good - with a compelling story behind it. The story is fine, the writing just needs work. I edited quite a bit but I cannot get it where it needs to be. HELP!