Complex sentence: The Otaibah tribe are the descendants of the mighty Pre-Islamic tribe of Hawazin, that are of the Qays ʿAylān tribal grouping, that are of the Adnan or the Adnanites, that are of the Ishmaelites, or the descendants of Ishmael, the elder son of Abraham.
Split into simpler sentences: The Otaibah tribe are the descendants of the mighty Pre-Islamic tribe of Hawazin, that are of the Qays ʿAylān tribal grouping, that are of the Adnan or the Adnanites, that are of the Ishmaelites. The tribe are considered by various genealogists to be the descendants of Ishmael, the elder son of Abraham.