Complex sentence: The first Catholic grade school in Perryville was opened to serve the German-speaking parish of St. Boniface., when the Precious Blood Sisters, a German Catholic female order opened a school for these children in 1887.
Split into simpler sentences: The first Catholic grade school in Perryville was opened to serve the German-speaking parish of St. Boniface. The Precious Blood Sisters, a German Catholic female order, were the first to open a school for these children in 1887.