Complex sentence: His name came of a little Amerindian group of the region and they are divided, since long time ago, in several communities, two of who is situated in remote areas together and have not maintained any contact between them.
Split into simpler sentences: His name came of a little Amerindian group of the region. They are divided, since long time ago, in several communities, two of who is situated in remote areas together and have not maintained any contact between them.