Complex sentence: De Coster made her debut in 2000, with under each other, dark tales about the disintegration of an unusual family, still appeared in the new international time zones book (meanwhile no longer exist).
Split into simpler sentences: De Coster made her debut in 2000, with Under Each Other, a collection of dark tales about the disintegration of an unusual family. Under Each Other appeared in the new international time zones book (meanwhile no longer exist).