Complex sentence: As of the second quarter of 2013, there were 52 AIB suppliers, which may market video cards under their own brands, and/or produce video cards for private label brands and/or computer manufacturers.
Split into simpler sentences: As of the second quarter of 2013, there were 52 AIB suppliers,. These AIB suppliers may market video cards under their own brands, and/or produce video cards for private label brands and/or produce video cards for computer manufacturers.