Complex sentence: Chandrika's mother, Sirimavo Bandaranaike, then became the world's first female prime minister in 1960 and her brother Anura Bandaranaike was a former Speaker of the Parliament of Sri Lanka and a former minister.
Split into simpler sentences: Chandrika's mother, Sirimavo Bandaranaike, then became the world's first female prime minister (1960). Her brother, Anura Bandaranaike, was a former Speaker of the Parliament of Sri Lanka and a former minister.