Complex sentence: For some reason, an old Polish aristocratic clan, of Sarmatian origin, chose the Raven as its symbol-possibly as its "Rodnidze", the "Totem-spirit of the Clan".
Split into simpler sentences: For some reason, an old Polish chivalry clan, from Sarmatian breeding, chose the Raven as his symbol. Perhaps was his "Rodnidze", the "Totem-spirit of the Clan".