Complex sentence: Shakuni was the brother of Gandhari, the wife of Dhritarashtra and mother of Kauravas.It seems Gandhari was married to a goat initially (without the knowledge of Dhritarashtra) before being married to Dhritarashtra, according to Sooth Sayers advice.
Split into simpler sentences: Shakuni was the brother of Gandhari, the wife of Dhritarashtra and mother of Kauravas. It was believed that Gandhari was married to a goat (without the knowledge of Dhritarashtra) before being married to Dhritarashtra, according to Sooth Sayers advice.