Complex sentence: Despite popular belief, the chair was not designed for the constructivist painter Wassily Kandinsky, who was concurrently on the Bauhaus faculty, but Kandinsky admired the completed design, and Breuer fabricated a duplicate for Kandinsky's personal quarters.
Split into simpler sentences: Despite popular belief, the chair was not designed for the constructivist painter Wassily Kandinsky, who was concurrently on the Bauhaus faculty. However, Kandinsky had admired the completed design, and Breuer fabricated a duplicate for Kandinsky's personal quarters.