original: the arkansas river is a major tributary of the mississippi river .
simplifications: the arkansas river is a large river that breaks off the mississippi river . the arkansas river is a major tributary of the mississippi river . the arkansas river is a major tributary of the mississippi river . the arkansas river is a main branch of the mississippi river . the arkansas river is a major tributary of the mississippi river . the arkansas river is a major river that flows into the mississipi river . the arkansas river is a tributary of the mississippi river . the arkansas river flows into the mississippi river .