Complex sentence: In 2001 Gruyère gained the Appellation d'Origine Contrôlée since then the production and the maturation is defined in the Swiss law and all Swiss Gruyere producer must follow these rules.
Split into simpler sentences: In 2001 Gruyère gained the Appellation d'Origine Contrôlée status. Since then the production and the maturation is defined in the Swiss law and all Swiss Gruyère producers must follow these rules.