Original sentence: Nucor Corporation () is one of the largest steel producers in the United States, and the largest of the "mini-mill" operators (those using electric arc furnaces to melt scrap steel, as opposed to companies using traditional integrated steel works with blast furnaces)
Edited sentence: Nucor Corporation () is one of the largest steel producers in the United States, and the largest of the "mini-mill" operators (those using electric arc furnaces to melt scrap steel, as opposed to companies operating integrated steel works with blast furnaces)