Complex sentence: The first settlers to arrive to the islands, almost 3,000 years B.C., were a pre-agricultural, pre-ceramic people, who migrated down the archipelago from Florience has proven that they were in actuality a group which has been labelled simply "Archaic people".
Split into simpler sentences: The first settlers to arrive to the islands, almost 3,000 years B.C., were a pre-agricultural, pre-ceramic people, who migrated down the archipelago from Florida. However, archaeological evidence has proven that they were in actuality a group which has been labelled simply "Archaic people".