Complex sentence: The Broadcasting Standards Commission stated the scenes were shocking, but "in the context was acceptable and important for the later narrative," however the watchdog still criticised the BBC for failing to warn viewers of the violence to come to the scene.
Split into simpler sentences: The Broadcasting Standards Commission stated the scene was shocking, but "in the context was acceptable and important for the later narrative". However the watchdog still criticised the BBC for failing to warn viewers of the violence to come to the scene.