Complex sentence: Gettones became so common and so well-known that they were inoffically considered legal tender, as they were usually accepted as payment, it was valued 50 lire up to 1980,100 lire up to 1984 and 200 lire from 1984.
Split into simpler sentences: Gettones became so common and so well-known that they were inoffically considered legal tender, as they were usually accepted as payment. One "Gettone" was valued 50 lire up to 1980,100 lire up to 1984 and 200 lire from 1984.