Complex sentence: Initial American pressings of the record came with a bonus 12 with six additional tracks, two of which are covers; the American cassette also had the same bonus tracks, split up so that each side of the cassette contained half of the bonus tracks.
Split into simpler sentences: Initial American pressings of the record came with a bonus 12 with six additional tracks, two of which are covers. The American cassette also had the same bonus tracks, split up so that each side of the cassette contained half of the bonus tracks.