Complex sentence: She's so afraid of drawing attention to herself that she can't tell the handsome Kamijo how much she loves him-until one day she finally gets up the courage to write him a letter confessing her feelings.
Split into simpler sentences: She's so afraid of drawing attention to herself that she can't tell the handsome Kamijo how much she loves him. One day she finally gets up the courage to write him a letter confessing her feelings.