Original sentence: In  Occidental History the occupation of Baltic states generally refers to the occupation of the Baltic states (Estonia, Latvia, and Lithuania) first by the Soviet Union, then Nazi Germany, and again by the Soviets during World War II, and to the Soviet presence in the Baltics from 1945 until the re-establishment of their independence
Edited sentence: The occupation of Baltic states generally refers to the occupation of the Baltic states (Estonia, Latvia, and Lithuania) first by the Soviet Union, then Nazi Germany, and again by the Soviets during World War II, and to the Soviet presence in the Baltics from 1945 until the re-establishment of their independence