Complex sentence: One of her rare excursions into the world of pop music, Caballé's duet with rock singer Freddie Mercury of Queen, "Barcelona", became a hit single in 1987, accompanied by an album of the same name which was released the following year.
Split into simpler sentences: One of her rare excursions into the world of pop music, Caballé's duet with rock singer Freddie Mercury of Queen, "Barcelona", became a hit single in 1987. The single was followed by an album of the same name which was released the following year.