Complex sentence: If from a relationship with the serpent a child is born, the child is believed to be born black, with hooves instead of feet, eyes without eyelids and its body cold and the child is fated to live a very short life.
Split into simpler sentences: If from a relationship with the serpent a child is born, the child is believed to be born black, with hooves instead of feet, eyes without eyelids and its body cold. Such a child is fated to live a very short life.