Complex sentence: Originally the cathedral was a burial place of the Kievan rulers including Vladimir Monomakh, Vsevolod Yaroslavich and of course the cathedral's founder Yaroslav I the Wise, although only the latter's grave survived to our days.
Split into simpler sentences: Originally the cathedral was a burial place of the Kievan rulers including Vladimir Monomakh, Vsevolod Yaroslavich and of course the cathedral's founder Yaroslav I the Wise. Although only the latter's grave survived to our days.