Complex sentence: The name was almost forgotten in 1990s and in 2000s it was used like a trim/model level, as in the Fiat Stilo Abarth.
Split into simpler sentences: The name was almost forgotten in 1990s. In 2000s, Fiat used the Arbath brand to designate a trim/model level, as in the Fiat Stilo Abarth.