Complex sentence: The circumstances of Afanasy Fet's birth caused much controversy and some uncertainties remain, even the exact date of it is still unknown and being cited as either October 29 (old style), or November 23 or 29,1820.
Split into simpler sentences: The circumstances of Afanasy Fet's birth caused much controversy and some uncertainties still remain. Even the exact date of it is unknown and being cited as either October 29 (old style), or November 23 or 29,1820.