Complex sentence: The Bronze Age lasted from approx 4,500 years ago to 2,500 years ago (i.e.2,500BC to 500BC)--archaeological remains from this period include stone alignments, stone circles and fulachta fiadh (early cooking sites).
Split into simpler sentences: The Bronze Age lasted from approx 4,500 years ago to 2,500 years ago (2,500BC to 500BC). Archaeological remains from this period include stone alignments, stone circles and fulachta fiadh (early cooking sites).