Complex sentence: Pamboeotia (Gr.) was a major festive panegyris of all the Boeotians, celebrated probably annually, which the grammarians compare with the Panathenaea of the Atticans, and the Panionia of the Ionians.
Split into simpler sentences: Pamboeotia (Gr.) was a major festive panegyris of all the Boeotians, celebrated probably annually. The grammarians compare the Pamboeotia with the Panathenaea of the Atticans, and the Panionia of the Ionians.