Complex sentence: The ancestors of most of the residents of Mayoon came in the early 19th century from the town of Nasirabad, 1556 km to the south in Pakistan's Indus River Valley.
Split into simpler sentences: The ancestors of most of the residents of Mayoon came in the early 19th century from the town of Nasirabad. This area is located 1556 km to the south in Pakistan's Indus River Valley.