Complex sentence: Widespread protests against have erupted in the Kashmir valley since his death, in which 65 people have died as of mid-August 2016, in what has been described as the worst unrest in the region since the 2010 Kashmir unrest.
Split into simpler sentences: Widespread protests against have erupted in the Kashmir valley since his death, in which 65 people have died as of mid-August 2016. The violence which erupted after his death has been described as the worst unrest in the region since the 2010 Kashmir unrest.