Complex sentence: The forest of Gribskov offers a rare opportunity to observe free roaming deer of all the four species living in Denmark; namely the roe deer, sika deer, red deer and fallow deer, with roe and fallow deer being most common in Gribskov.
Split into simpler sentences: The forest of Gribskov offers a rare opportunity to observe free roaming deer of all the four species living in Denmark. This includes the roe deer, sika deer, red deer and fallow deer, with roe and fallow deers as the most common in Gribskov.