Complex sentence: After 1819 Borovikovsky became a Freemason, member of a lodge "Dying Sphinx", at that time he mostly painting icons, including Iconostasis of the Smolensky Cemetery church and some icons for Kazan Cathedral in Saint-Petersburg.
Split into simpler sentences: After 1819 Borovikovsky became a Freemason, member of a lodge "Dying Sphinx". At that time he mostly painted icons, including Iconostasis of the Smolensky Cemetery church and some icons for Kazan Cathedral in Saint-Petersburg.