Complex sentence: The same peace ruled in Scandinavia and it was called "the Fródi peace" when no man hurt another, even if he met his father's or his brother's killer, free or tied.
Split into simpler sentences: The same peace ruled in Scandinavia, but there it was called "the Fródi peace". The North was so peaceful that no man hurt another, even if he met his father's or his brother's killer, free or tied.