Complex sentence: In mid- 1945 4.5 to 4.6 million Germans were on Polish territory, by the beginning of 1946 550,000 Germans had already been expelled from Poland and 932,000 had been verified as having Polish nationality.
Split into simpler sentences: In mid- 1945,4.5 to 4.6 million Germans were on Polish territory. By the beginning of 1946,550,000 Germans had already been expelled from Poland and 932,000 had been verified as having Polish nationality.