The file contains two chairs (white and coffee) and a sphere with a multicomponent gray chair with a yellow blanket. To get a gray chair, you need to assign the material from the sphere to the white chair, which is called "White" (or the material that is in the first cell in the material editor and is called "Gray")
The OBJ file contains 3 objects: "Pillow_And_Long_Plaid" This is a pillow with a long nylon blanket, "Pillow_And_Knitted_Plaid" This is a pillow with a knitted blanket and an "Armchair" This is the chair itself. Only these objects are found, since all other geometry is the same. All this is done so that the archive weighs less. Have a nice day!
https://www.cosmorelax.ru/catalog/interernye/kreslo_wally_wyl_01hw/