Complex sentence: The Tututni (Lower Rogue River Athabascan) tribes spoke dialects of the Lower Rogue River (or Tututni or Tututni-Shasta Costa-Coquille) language an extinct Pacific Coast Athabaskan language classified as part of the Oregon Athabascan subgroup.
Split into simpler sentences: The Tututni (Lower Rogue River Athabascan) tribes spoke dialects of the Lower Rogue River (or Tututni or Tututni-Shasta Costa-Coquille) language. In the 21st century, this Pacific Coast Athabaskan language is extinct; it was classified as part of the Oregon Athabascan subgroup.