Complex sentence: The area was long inhabited by the Santee or Eastern Dakota Sioux, and the Anglicized term for the lake derives from their Dakota-language name, "Okoboozhy", meaning reeds and rushes.
Split into simpler sentences: The area was long inhabited by the Santee or Eastern Dakota Sioux. The lake was known after its Dakota-language name, "Okoboozhy", meaning reeds and rushes.