Complex sentence: Saïd is shown with the gun after the riot breaks out however is only shown firing it once to gain the inmates' attention, and threatens Adebisi after he starts going through heroin withdrawal.
Split into simpler sentences: Saïd is shown with the gun after the riot breaks out. However, he is only shown firing it once to gain the inmates' attention, and threatens Adebisi after he starts going through heroin withdrawal.