Complex sentence: In 1579, Vieta printed his "canonem mathematicum" (Metayer publisher); a year later he was appointed maître des requêtes in the parliament of Paris; committed to serve the King.
Split into simpler sentences: In 1579, Vieta printed his "canonem mathematicum" (Metayer publisher). In 1580, he was appointed maître des requêtes in the parliament of Paris; committed to serve the King.