Complex sentence: He is married to the daughter of Mulla Khudadad, Headman of the Rais of Turbut, who in his turn married Mulla Mubarak's mother on her first husband's death.
Split into simpler sentences: He is married to the daughter of Mulla Khudadad, the Headman of the Rais of Turbut. He in his turn married Mulla Mubarak's mother on her first husband's death.