Complex sentence: They also laid out and designed the mill, model town and church at Saltaire (1851-76), all in an Italianate Classical style, at the time one of the most important examples of a philanthropic industrial and housing development in the world.
Split into simpler sentences: They also laid out and designed the mill, model town and church at Saltaire (1851-76), all in an Italianate Classical style. At the time, Saltaire was one of the most important examples of a philanthropic industrial and housing development in the world.