Complex sentence: After only a century, however, the Norman Hauteville dynasty died out and the south German (Swabian) Hohenstaufen dynasty ruled starting in 1194, adopting Palermo as its principal seat from 1220.
Split into simpler sentences: After only a century, however, the Norman Hauteville dynasty died out. The South German (Swabian) Hohenstaufen dynasty ruled starting in 1194, adopting Palermo as its principal seat from 1220.