Complex sentence: The museum's large atrium (originally a courtyard, now covered in glass and fabric) contains a huge, centrally draped chandelier-like ceiling piece consisting of metal plates decorated with fine geometric and epigraphic cuttings.
Split into simpler sentences: The museum's large atrium was originally a courtyard, and is now covered in glass and fabric. It contains a huge, centrally draped chandelier-like ceiling piece consisting of metal plates decorated with fine geometric and epigraphic cuttings.