Complex sentence: Rao Bika, the Rathore ruler, then aligned himself with the Godara Jats, the most powerful of the six cantons of Jats ruling over Jangladesh.
Split into simpler sentences: Rao Bika, the Rathore ruler then aligned himself with the Godara Jats. The Godara Jats were the most powerful of the six cantons of Jats ruling over Jangladesh.