Complex sentence: Erzebet Ondrushko, a vampiress who bathed in the blood of innocents to stay young, and sold her soul to the Queen of Witches, the goddess Hecate, was responsible, and had just kidnapped the fiancee of one of the townsmen.
Split into simpler sentences: Erzebet Ondrushko, a vampiress who bathed in the blood of innocents to stay young, was responsible. She had sold her soul to the Queen of Witches, the goddess Hecate, and had just kidnapped the fiancee of one of the townsmen.