Complex sentence: In the 1960s, Graubner mounted picture-size coloured cushions onto his paintings and used Perlon fabric in an attempt to enhance the spatial effect of colour surfaces.
Split into simpler sentences: In the 1960s, Graubner began to create works which he mounted picture-size colour cushions in his pictures and later cover them over with Perlon fabric. This was an attempt to enhance spatial effect of colour surfaces.