Complex sentence: Vasudeva married Devaki, the sister of Kansa, and he was also the father of Krishna's sister Subhadra, from his first wife, Rohini, who bore his eldest son, Balarama.
Split into simpler sentences: Vasudeva married Devaki, the sister of Kansa, and he was also the father of Krishna's sister Subhadra. From his first wife, Rohini, who bore his eldest son, Balarama.