Complex sentence: Skoglund studies ancient DNA to verify old or new theories, mostly about how humans populated Earth and found proof that the first Polynesians came from East Asia along with another study that found genetic evidence of two founding populations of the Americas.
Split into simpler sentences: Skoglund studies ancient DNA to verify old or new theories, mostly about how humans populated Earth. He found proof that the first Polynesians came from East Asia along with another study that found genetic evidence of two founding populations of the Americas.