You would probably split google's search engine off from the rest of their services/products, so that they can't use their search engine dominance to unfairly harm competition.
Similarly, you could divide Amazon into a platform company that does fulfillment for others and a separate company that sells their own products, as well as splitting off things like AWS into their own companies.
Similarly, you could divide Amazon into a platform company that does fulfillment for others and a separate company that sells their own products, as well as splitting off things like AWS into their own companies.