Complex sentence: Gran Dolina is a cave site in the Atapuerca region of Spain, where archaeologists have found five or six hominids dating to between 800,000 to 1 million years ago.
Split into simpler sentences: Gran Dolina is a cave in the Atapuerca region of Spain. Archaeologists have found five or six hominids on this site dating to between 800,000 to 1 million years ago.