Complex sentence: A dark blue version that was only made accidentally in 1995 represents the rarest of all general issue Beanie Babies, and is one of the rarest Beanies, while the proper light blue color was used until Peanut retired in 1998.
Split into simpler sentences: A dark blue version that was only made accidentally in 1995 is one of the rarest Beanie Babies. The proper light blue color was used until Peanut retired in 1998.