Complex sentence: The Jats were Originally pastoralists in the lower Indus river-valley of Sindh, Jats migrated north into the Punjab region in late medieval times, and subsequently into the Delhi Territory, northeastern Rajputana, and the western Gangetic Plain in the 17th and 18th centuries.
Split into simpler sentences: The Jats were originally pastoralists in the lower Indus river-valley of Sindh. They migrated north into the Punjab region in late medieval times, and subsequently into the Delhi Territory, northeastern Rajputana, and the western Gangetic Plain in the 17th and 18th centuries.