Complex sentence: The Hohenstaufens were often called Ghibellines, which derives from the Italianized name for the Weibling castle, the family seat in Swabia; the Welfs, in a similar Italianization, were called Guelfs.
Split into simpler sentences: The Hohenstaufens were often called Ghibellines, which derives from the Italianized name for the Weibling castle, the family seat in Swabia. The Welfs, in a similar Italianization, were called Guelfs.