Complex sentence: Einsatzgruppe IV was formally disbanded in November, 1939 and it's officers and men transferred to the Polish General Government and incorporated into stationary units of the Sicherheitspolizei.
Split into simpler sentences: Einsatzgruppe IV was formally disbanded in November, 1939. It's officers and men were transferred to the Polish General Government and incorporated into stationary units of the Sicherheitspolizei.