Complex sentence: Gen. Filip Aglacow, completed its relocation to airfields in the area of Myślibórz, but only the 2nd Ground-Attack Division and the 3rd Fighter Division because the 1st Bomb Division was still training in central Poland.
Split into simpler sentences: Gen. Filip Aglacow, completed its relocation to airfields in the area of Myślibórz. In fact it was only the 2nd Ground-Attack Division and the 3rd Fighter Division because the 1st Bomb Division was still training in central Poland.