Complex sentence: It became the owner of 18 blast furnaces and the capacity to produce 80,000 tons of pig iron and 50,000 tons of finished iron per year, as well as a thousand workers' cottages and 500 acres of land.
Split into simpler sentences: It became the owner of 18 blast furnaces, and had the capacity to produce 80,000 tons of pig iron and 50,000 tons of finished iron per year. The company also owned a thousand workers' cottages and 500 acres of land.