Complex sentence: When these conditions are met it is believed that the life of an archival-quality CD-R or DVD-R can be as long as 100 years, compared to the typical five to ten years for non-archival quality optical discs.
Split into simpler sentences: When these conditions are met, the life of a CD-R or DVD-R can be as long as 100 years. This is considerable compared to the average lifespan of five to ten years for non-archival quality optical discs.