Complex sentence: The iTunes version features a 10th'disc' or group of tracks, featuring 11 rarities and mixes, similar to the collection featured on the final disc of the "Thank You for the Music" box set.
Split into simpler sentences: The iTunes version features a 10th'disc' or group of tracks, featuring 11 rarities and mixes. Similar to the collection featured on the final disc of the "Thank You for the Music" box set.