Complex sentence: Until World War II, the Catholic residents of Poznan Lazarus belonged to the Parish of Our Lady of Sorrows, but at that time, a significant part of the inhabitants of this part of Poznan were Evangelical Germans (approx.30%).
Split into simpler sentences: Until World War II, the Catholic residents of Poznan Lazarus belonged to the parish of Our Lady of Sorrows. A significant part of the inhabitants of this part of the city were evangelical Germans (approx.30%).