Complex sentence: Summer savory is a characteristic ingredient of Herbes de Provence: a fairly standard mixture of dried herbs sold in most French food stores since the 1970s, and widely used as a seasoning for grilled meats and barbecues, as well as in stews and sauces.
Split into simpler sentences: Summer savory is a characteristic ingredient of herbes de Provence, a fairly standard mixture of dried herbs sold in most French food stores. It is also widely used as a seasoning for grilled meats and barbecues, as well as in stews and sauces.