Complex sentence: Zofia Kossak was the daughter of Tadeusz Kossak, the twin brother of painter Wojciech Kossak, and a granddaughter of painter Juliusz Kossak.
Split into simpler sentences: Zofia Kossak was the daughter of Tadeusz Kossak, who was the twin brother of painter Wojciech Kossak. She was also a granddaughter of painter Juliusz Kossak.