Complex sentence: At the Church of St John Maddermarket there is an early seventeenth century marble mural monument, the Layer Monument whose four Northern Mannerist figurines are collective components of an alchemical mandala.
Split into simpler sentences: At the Church of St John Maddermarket there is an early seventeenth century marble mural monument, the Layer Monument. Its four Northern Mannerist figurines collectively are components of an alchemical mandala.