Task: Sentence Expansion
Input (English): The Western Dakota are also called the Yankton or Yanktonai , and are located in the Missouri River area .
Output (English): The Western Dakota are the Yankton , and the Yanktonai ( " Iha ́ ŋkth ̌ uŋwaŋ " and " Iha ́ ŋkth ̌ uŋwaŋna " ; " Village-at-the-end " and " Little village-at-the-end " ) , who reside in the Upper Missouri River area .