Complex sentence: It was also one of those Criterion discs that was unfortunately subject to a bronzing issue which would discolor the disc bronze and render it unplayable, this was due to a pressing issue with the factory though not every disc was subject to bronzing.
Split into simpler sentences: It was also one of those Criterion discs that was unfortunately subject to a bronzing issue which would discolor the disc bronze and render it unplayable. This was due to a pressing issue with the factory though not every disc was subject to bronzing.