Complex sentence: These kings belonged to two distinct dynasties: the earlier line of the "Solar race" which had a succession of seven kings of the Ratti tribe, and the later line of the Ganga race, itself claimed to be a branch of the Solar race.
Split into simpler sentences: These kings belonged to two distinct dynasties: the earlier line of the "Solar race" which had a succession of seven kings of the Ratti tribe, and the later line of the Ganga race. The ganga race itself claimed to be a branch of the Solar race.