Original sentence: Thousands of Serbs were declared missing, and hundreds were killed brutally in the Operation Flash and in the Operation Storm in the summer of 1995
Edited sentence: Thousands of Serbs were declared missing, and hundreds were killed brutally in the Operation Flash and in the Operation Storm in the summer of 1995, when the Republic of Serbian Krajina was crushed by the Croatian Army, with the help of NATO forces who bombarded the Serbian positions days before