Complex sentence: It derives its name from the 562 tribes found in the United States at the time of conception in 2012, though as of 2015 there are 566 federally recognized tribes located within the boundaries of the US.
Split into simpler sentences: It derives its name from the 562 tribes found in the United States at the time of conception in 2012. Though, as of 2015 there are 566 federally recognized tribes located within the boundaries of the US.