Complex sentence: These could be clerics, men who learned about medicine and black magic from books, and those who claimed to inherit power from their families and thus could foresee the future, particularly on an "Ysbrydnos", and give charms to ward off evil.
Split into simpler sentences: These could be clerics, men who learned about medicine and black magic from books, and those who inherited power from their families. Could foresee the future, particularly on an "Ysbrydnos", and give charms to ward off evil.