Complex sentence: But in mid of 1941, the Zel'dovich family moved to Petrograd (now St. Petersburg) and resided until August 1941 when the family was evacuated together with the faculty of the Institute of Chemical Physics to Kazan to avoid the Axis Invasion of the Soviet Union.
Split into simpler sentences: But in mid of 1941, the Zel'dovich family moved to Petrograd (now St. Petersburg). They resided there until August 1941, when the family was evacuated together with the faculty of the Institute of Chemical Physics to Kazan to avoid the Axis Invasion of the Soviet Union.