Complex sentence: Juubei is protective of his older sister, Sakura and will come to her defence if she is threatened and ever since he was a child, he has protected Kazuki, as he believed his clan was destined to guard his family.
Split into simpler sentences: Juubei is protective of his older sister, Sakura, and will come to her defence if she is threatened. Ever since he was a child, he has protected Kazuki, as he believed his clan was destined to guard his family.