Original sentence: In October, Germans declared that the poor conditions in the ghetto created a health hazard for local inhabitants and that an epidemics have started in the ghetto; in fact this was a pretext to move and massacre the Jews.It was created immediately after German have taken the town of Vitebsk on 11 July 1941.Less than three months later, on 8 October 1941, the Nazis begun a massacre of the Vitebsk Jews, which ended on 11 October with the deaths of most of the ghetto's inhabitants (sources vary as to the exact number)
Edited sentence: In October, Germans declared that the poor conditions in the ghetto created a health hazard for local inhabitants and that an epidemics had started in the ghetto; in fact, this was a pretext to move and massacre the Jews.It was created immediately after Germans took the town of Vitebsk on 11 July 1941.Less than three months later, on 8 October 1941, the Nazis began a massacre of the Vitebsk Jews, which ended on 11 October with the deaths of most of the ghetto's inhabitants (sources vary as to the exact number)