Complex sentence: Eileen Olszewski is the first female boxer from Hawaii to achieve international success at the professional and amateur levels, is the oldest professional flyweight boxer, male or female, to win a share of the world flyweight title in history.
Split into simpler sentences: Eileen Olszewski is the first female boxer from Hawaii to achieve international success at the professional and amateur levels. She is the oldest professional flyweight boxer, male or female, to win a share of the world flyweight title in history.