Complex sentence: Other criticisms claim that the director paid too much attention to the performers with a consequent lack of attention on the images and fireworks which accompanied the concert, however this might be due to the fact that the cameras were inoperable at the time.
Split into simpler sentences: Other criticisms claim that the director paid too much attention to the performers with a consequent lack of attention on the images and fireworks which accompanied the concert. However this might be due to the fact that the cameras were inoperable at the time.