Complex sentence: The puddling process, developed in the 1840s, produced a satisfactory grade of wrought iron for many applications at a cost far below crucible steel; however, while puddled iron was suitable for structural applications, it did not replace steel in cutting tools.
Split into simpler sentences: The puddling process, developed in the 1840s, produced a satisfactory grade of wrought iron for many applications at a cost far below crucible steel. While puddled iron was suitable for structural applications, it did not replace steel in cutting tools.