Complex sentence: Sambhaji was born at Purandar fort; his mother Saibai, Shivaji's favourite wife, died when he was two, and he was raised by his paternal grandmother Jijabai.
Split into simpler sentences: Sambhaji was born at Purandar fort to Saibai, Shivaji's favourite wife. His mother died when he was two and he was raised by his paternal grandmother Jijabai.