Original sentence: The assassin was a member of the pro-Bulgarian Internal Macedonian Revolutionary Organization (IMRO) and an experienced marksman.While Alexander was being driven in a car through the streets along with French Foreign Minister Louis Barthou, a gunman - the Bulgarian Vlado Chernozemski, stepped from the street and shot the King and the chauffeur with a Mauser C96 semiautomatic pistol
Edited sentence: The assassin was a member of the  Internal Macedonian Revolutionary Organization (IMRO) and an experienced marksman.While Alexander was being driven in a car through the streets along with French Foreign Minister Louis Barthou, a gunman - the Macedonian Vlado Chernozemski, stepped from the street and shot the King and the chauffeur with a Mauser C96 semiautomatic pistol