Complex sentence: Important human migrations occurred in the Pacific in prehistoric times, most notably those of the Polynesians from the Asian edge of the ocean to Tahiti, Hawaii, New Zealand, Easter Island and possibly even America.
Split into simpler sentences: Important human migrations occurred in the Pacific in prehistoric times. The greatest migrations took place through the the Polynesians, from the Asian edge of the ocean to Tahiti, Hawaii, New Zealand, Easter Island and possibly even America.