Complex sentence: Throughout history, the Maniots have been known by their neighbors and their enemies as fierce warriors who practice blood feuds-so fierce and savage, in fact, that they have been compared to the Nordic Berserkers.
Split into simpler sentences: Throughout history, the Maniots have been known by their neighbors and their enemies as fierce warriors who practice blood feuds. So fierce and savage in fact, that they have been compared to the Nordic Berserkers.