Complex sentence: Since being a daughter of Bellona, she's a natural when it comes to fight, she is very proficient in fighting with her spear or dagger and was able to hold off against the giant Polybotes with the help of Scipio.
Split into simpler sentences: Since being a daughter of Bellona, she's a natural when it comes to fighting. She is very proficient in fighting with her spear or dagger and was able to hold off against the giant Polybotes with the help of Scipio.