Complex sentence: Borte had been held captive for eight months, and she gave birth to Jochi after she was rescued, leaving doubt as to who the father of the child was, though Genghis always clearly claimed the boy as his son.
Split into simpler sentences: Borte had been held captive for eight months, and she gave birth to Jochi after she was rescued, leaving doubt as to who the father of the child was. However, Genghis always clearly claimed the boy as his son.