Complex sentence: The Irish Elk, or Giant Deer, and the Red Deer both became extinct in Ireland about 10,500 years ago during the Nahanagan Stadial; many of their skeletal remains have been found well preserved in peat land.
Split into simpler sentences: The Irish Elk, or Giant Deer, and the Red Deer both became extinct in Ireland about 10,500 years ago during the Nahanagan Stadial. Many of their skeletal remains have been found well preserved in peat land.