Complex sentence: Shiva falls in love with her but cannot marry her because of a law that considers her to be a Vikarma, the untouchables who bear misfortunes in this life due to sins of their past births.
Split into simpler sentences: Shiva falls in love with her but cannot marry her because of a law that considers her to be a Vikarma, an untouchable. Vikarmas are people who bear misfortunes in this life due to sins of their past births.