Complex sentence: In the period between World Wars I and II, the Company manufactured agricultural machines and devices, and after annexation of Northern Lands in 1945 year to Poland, the Company was one of the first industrial plants activated on territory of then "Olsztyn Province".
Split into simpler sentences: In the period between World Wars I and II, the Company manufactured agricultural machines and devices. After annexation of Northern Lands in 1945 to Poland, the Company was one of the first industrial plants activated in the territory of the then "Olsztyn Province".