Complex sentence: She is the first girl to join the BXB what makes her kind of famous at school.She is confessed by Yoshinaga at Valentines but she realizes she is in love with Kuremura and then rejects him.
Split into simpler sentences: She is the first girl to join the BXB what makes her kind of famous at school. Yoshinaga confesses his feelings for her at the Valentines Day event, but she realizes she is in love with Kuremura and rejects him.