Complex sentence: This helped the song to get a lot of airplay, and the song became a commercial success, giving hitomi at the end of that year the chance to perform the song at the annual "Kōhaku Uta Gassen".
Split into simpler sentences: This helped the song to get a lot of airplay, and become a commercial success. She performed the song at the annual "Kōhaku Uta Gassen".