Complex sentence: Plebiscite on Warmia and Mazury took place on VII 1920 during the bolshevik offensive against Warsaw, and as a result 97.9% of people voted to remain part of Germany.
Split into simpler sentences: Plebiscite on Warmia and Mazury took place on VII 1920 during the bolshevik offensive against Warsaw. As a result, 97.9% of people voted for remaining part of Germany.