Complex sentence: The first human migrants-Australo-Melanesians-are attributed to the Hoabinhian cultural sites tend to popülate the highlands and the interior, less accessible regions of Laos to this day.
Split into simpler sentences: The first human migrants-Australo-Melanesians-are attributed to the Hoabinhian cultural sites. They tend to popülate the highlands and the interior, less accessible regions of Laos to this day.