Complex sentence: A powerful sept of the Uí Liatháin were the Uí Meic Caille (Uí Maic Caille), who gave their name to the Barony of Imokilly.
Split into simpler sentences: A powerful sept of the Uí Liatháin were the Uí Maic Caille. They gave their name to the Barony of Imokilly.