Complex sentence: She is often compared with Vlad III the Impaler of Wallachia, on whom the fictional Count Dracula is partly based (having contributed some of the mythos herself), and has been nicknamed "The Blood Countess" and "Countess Dracula".
Split into simpler sentences: She is often compared with Vlad the Impaler of Wallachia (on whom the fictional Count Dracula is partly based), having contributed some of the mythos to the Dracula legend herself. Nicknames and literary epithets attributed to her include "The Blood Countess" and "Countess Dracula".