Complex sentence: Northwestern Steel and Wire, in Sterling, Illinois, ended up with 8376 and other steam locomotives, instead of melting them down the company renovated them and used them to replace their aging internal locomotives within the steel mill grounds.
Split into simpler sentences: Northwestern Steel and Wire, in Sterling, Illinois, ended up with 8376 and other steam locomotives, and instead of melting them down the company renovated them. The company then used them to replace their aging internal locomotives, used within the steel mill grounds.