Complex sentence: While the Indian caste system generally modelled the four-fold division of society into Brahmins, Kshatriyas, Vaisyas and Shudras, in Kerala the Nambudiri Brahmins formed the priestly class and only rarely recognized anyone else as being other than Shudra or untouchables outside the caste system entirely.
Split into simpler sentences: While the Indian caste system generally modelled the four-fold division of society into Brahmins, Kshatriyas, Vaisyas and Shudras, in Kerala the Nambudiri Brahmins formed the priestly class. They only rarely recognized anyone else as being other than Shudra or untouchables outside the caste system entirely.