Complex sentence: Until the early 2000s beds were normally upholstered with a single fabric--usually a damask ticking, or for inexpensive bedsets, a nonwoven fabric--covering all surfaces of the mattress and foundation.
Split into simpler sentences: Until the early 2000s, beds were normally upholstered with a single fabric. This was usually a damask ticking or, for inexpensive bedsets, a nonwoven fabric covering all surfaces of the mattress and foundation.