Complex sentence: They were classified as untouchable community under Hindu ritual ranking system and are now classified as a Scheduled Caste under India's system of positive discrimination.They were traditionally considered outside the Hindu ritual ranking system of castes known as varna.
Split into simpler sentences: They were classified as untouchable community under Hindu ritual ranking system and are now classified as a Scheduled Caste under India's system of positive discrimination. As untouchables, they were traditionally considered outside the Hindu ritual ranking system of castes known as varna.