Complex sentence: When he was a teenager he was already introducing himself to the world of Italian House & Dance Music-until 1997 when he released his first single called "Laguna", reaching a disappointing number 52 in the Italian Singles Chart.
Split into simpler sentences: When he was a teenager, he was already introducing himself to the world of Italian house and dance music. In 1997, he released his first single, "Laguna", which reached a disappointing number 52 in the Italian Singles Chart.