Complex sentence: Raghunatha Kilavan Setupati of Ramnad (1673--1708 A.D.) married Kathali Nachiar the sister of Thondaiman, he appointed his brother in law Raghunatha Thondaiman as a chief of the district of Pudukottai.
Split into simpler sentences: Raghunatha Kilavan Setupati of Ramnad (1673--1708 A.D.) married Kathali Nachiar, the sister of Thondaiman. He appointed his brother-in-law, Raghunatha Thondaiman, as a chief of the district of Pudukottai.