Original sentence: After the First World War, Poland regained independence and 70% of the dissolved province of the West Prussia, with a Polish majority, became part of Poland.The German politicians referred to this area as the corridor.The cession to the Second Polish Republic had been proclaimed in June 1919
Edited sentence: In the post-World War I period, the "corridor" was established from 70% of the dissolved former province of West Prussia.Its cession to the Second Polish Republic had been proclaimed in June 1919