Complex sentence: The Saraiki speaking Arain are the ancient inhabitants of the district whereas Punjabi speaking Arain came here, and then settled in 1930s and after partition from upper Punjab and eastern (Indian) Punjab.
Split into simpler sentences: The Saraiki speaking Arain are the ancient inhabitants of the district. Whereas Punjabi speaking Arain came here, and then settled in 1930s and after partition from upper Punjab and eastern (Indian) Punjab.