Complex sentence: Humans have made use of the hill since at least the Bronze Age and there are a number of ancient monuments sited there including several tumuli, a Roman signal station and what is thought to be an Iron Age animal pound.
Split into simpler sentences: Humans have made use of the hill since at least the Bronze Age. There are a number of ancient monuments sited there including several tumuli, a Roman signal station and what is thought to be an Iron Age animal pound.