Complex sentence: The Semetex prototype design actually had the 8 channels of uncompressed data placed into 3 locations: data bordering both sides of the analog sound track and additional data tracks bordering the opposite edge of the picture frame.
Split into simpler sentences: The Semetex prototype design actually had the 8 channels of uncompressed data placed into 3 locations. Data bordering both sides of the analog sound track and additional data tracks bordering the opposite edge of the picture frame.