Original sentence: Throughout 1940 and 1941, the Kingdom of Bulgaria, under Tsar Boris III, allied itself with Adolf Hitler's Germany and captured Dobrudja, Thrace, and much of Macedonia in the process
Edited sentence: Throughout 1940 and 1941, the Kingdom of Bulgaria, under Tsar Boris III, allied itself with Adolf Hitler's Germany, entered the regained Southern Dobrudja, and captured Thrace, and much of Macedonia in the process