Complex sentence: All the walls inside are painted in bright colours with 1785 murals by Radu Munteanu hudozhnikomi and Nicholas Mann as attested by inscriptions in Cyrillic that are preserved in the altar and adorned with decorative sculptures.
Split into simpler sentences: All the walls inside are painted in bright colours with murals by Radu Munteanu hudozhnikomi and Nicholas Mann. The murals which date from 1785 are described by inscriptions in Cyrillic that are preserved in the altar and adorned with decorative sculptures.