Complex sentence: The majority of Native Hawaiians reside in the State of Hawaiʻi (two-thirds), and the rest are scattered among other states, especially in the American Southwest, and with a high concentration in California.
Split into simpler sentences: The majority of Native Hawaiians reside in State of Hawaiʻi and the American Southwest. Two-thirds live in the State of Hawaii while the other one-third is scattered among other states, with a high concentration in California.