Complex sentence: From 1946-2002, the federally recognized tribe was known as the Sisseton Wahpeton Sioux Tribe, except for a brief period in 1994, when they called themselves the Sisseton-Wahpeton Dakota Nation.
Split into simpler sentences: From 1946-2002, the federally recognized tribe was known as the Sisseton Wahpeton Sioux Tribe. For a brief period in 1994, they identified as the Sisseton-Wahpeton Dakota Nation.