Complex sentence: In 1899, the school was officially dedicated in a celebration attended by members of Polish lodges from around the Delaware Valley, Bishop Edmond F. Prendergast blessed the building, which was adorned with American and Polish flags.
Split into simpler sentences: In 1899, the school was officially dedicated in a celebration attended by members of Polish lodges from around the Delaware Valley, Bishop Edmond. F Prendergast blessed the building, which was adorned with American and Polish flags.