Complex sentence: The Interior of the hall was as lavish as the exterior, the most notable features are a series of plaster bas-reliefs designed by John Gibson and Thorwaldsen, who was an international sculptor from Conway and trained in Rome.
Split into simpler sentences: The Interior of the hall was as lavish as the exterior. The most notable features are a series of plaster bas-reliefs designed by John Gibson and Thorwaldsen, an international sculptor from Conway who trained in Rome.