Complex sentence: Mariana is shown her full length, wearing a black dress with silver braid, and adorned with jewellery: gold necklaces and bracelets, and a large gold brooch on her close-fitting bodice.
Split into simpler sentences: Mariana is shown her full length, wearing a black dress with silver braid. She is adorned with jewellery: gold necklaces, bracelets and a large gold brooch on her close-fitting bodice.