Complex sentence: Rather than be a bride, she wants to pursue studies in accounting and business, however when her fiancé Shinjirō (11 years older than her) comes to visit, her life begins to change.
Split into simpler sentences: Rather than be a bride, she wanted to pursue studies in accounting and business. When her fiancé Shinjirō (11 years older than her) came to visit however, her life began to change.