Complex sentence: Khowar has been written in the Nasta'liq script since the early twentieth century, prior to that the administrative and literary language of the region was Persian and works such as poetry and songs in Khowar were passed down in oral tradition.
Split into simpler sentences: Khowar has been written in the Nasta'liq script since the early twentieth century. Prior to that, the administrative and literary language of the region was Persian and works such as poetry and songs in Khowar were passed down in oral tradition.