Complex sentence: A unique feature of the church is its number and variety of the angel images, of which there are more than five thousand images of angels in the church, in fresco, mural, wood, plaster, stone, metal and ivory.
Split into simpler sentences: A unique feature of the church is the number and variety of the angel images in the church. There are more than five thousand images of angels in the church, in fresco, mural, wood, plaster, stone, metal and ivory.