Complex sentence: The characteristic metals used for bracelets found in the area of the Siret River valley are bronze and iron, though silver was also probably used; a silver bracelet was found with a treasure of coins buried after 119--122 AD.
Split into simpler sentences: The characteristic metals used for bracelets found in the area of Siret River valley are bronze and iron. A silver bracelet was found with a treasure of coins buried after 119--122 AD.