Original sentence: Making fire to generate heat and light made it possible for people to migrate to colder climates and enabled people to cook food, which helped stop diseases spreading as much.The ability to control fire was a major change in the habits of early humans
Edited sentence: Fire making to generate heat and light made it possible for people to migrate to colder climates and enabled people to cook food — a key step in the fight against disease.The ability to control fire is one of humankind's great achievements