Complex sentence: A man of enlightened piety and of very austere life, Isaac owed his deposition by the king in 426 to his great independence of character in 430 he was allowed to resume his patriarchal throne.
Split into simpler sentences: A man of enlightened piety and of very austere life, Isaac owed his deposition by the king in 426 to his great independence of character. In 430 he was allowed to resume his patriarchal throne.