Complex sentence: On May Day, the Bulgarians celebrate the Irminden (or Yeremiya, Eremiya, Irima, Zamski den) associated with snakes and lizards and rituals are made in order to protect people from them.
Split into simpler sentences: On May Day, Bulgarians celebrate Irminden (or Yeremiya, Eremiya, Irima, Zamski den). The hodiday is associated with snakes and lizards and rituals are made in order to protect people from them.