Complex sentence: The latest kings of Gumma traced their origin to a man called Adam, who around 1770 came to live in the area, and is said to have helped in the deposition of the last king of the previous dynasty, Sarborada.
Split into simpler sentences: The latest kings of Gumma traced their origin to a man called Adam. Around 1770, he came to live in the area, and is said to have then helped in the deposition of the last king of the previous dynasty, Sarborada.