Complex sentence: Those fiefs were headed by a local warlord or family, and despite that those fiefs have long since been dismantled, merged, and reorganized numerous times over, and given legislative governance and oversight, the rough translation stuck.
Split into simpler sentences: Those fiefs were headed by a local warlord or family. Though the fiefs have long since been dismantled, merged, and reorganized multiple times, and been granted legislative governance and oversight, the rough translation stuck.