Complex sentence: In Robeson County alone, there are currently 46,869 Lumbee Indians out of a total county population of 123,339, and thus, the Lumbee make up 38.02%, making them the largest racial/ethnic group in the county.
Split into simpler sentences: In Robeson County, there are 46,869 Lumbee out of a total county population of 123,339. The Lumbee make up 38.02%, comprising the largest racial/ethnic group in the county.