Complex sentence: The principal settlement of the Luhya is the western province of Kenya but a substantial number of them have permanent settlements in the Kitale and Kapsabet areas of the Rift Valley province.
Split into simpler sentences: The principal settlement are of the Luhya was and is in the Western province of Kenya. A substantial number of them permanently settled in the Kitale and Kapsabet areas of the Rift Valley province.