Complex sentence: On Sunday, November 24, Oswald was being led through the basement of Dallas Police Headquarters in advance of his transfer to the county jail when, at 11:21 a.m., Dallas nightclub operator Jack Ruby stepped from the crowd and shot Oswald in his left lower chest.
Split into simpler sentences: On Sunday, November 24, Oswald was being led through the basement of Dallas Police Headquarters in advance of his transfer to the county jail. At 11:21 a.m., Dallas nightclub operator Jack Ruby stepped from the crowd and shot Oswald in his left lower chest.