Complex sentence: Richter later returned from Iraq to the US and wrote a scathing review of the lax standards to which Blackwater was held accountable, only two weeks before a serious Blackwater incident in which 17 Iraqi civilians were shot and killed by Blackwater employees under questionable circumstances.
Split into simpler sentences: Richter later returned from Iraq to the US and wrote a scathing review of the lax standards to which Blackwater was held accountable. Only two weeks after Richter had filed his harsh review of the Blackwater standards, a serious Blackwater incident occurred in which 17 Iraqi civilians were shot and killed by Blackwater employees under questionable circumstances.