Complex sentence: The Artognou stone (sometimes incorrectly referred to as the Arthur stone) was discovered in 1998 in securely dated sixth-century contexts among the ruins at Tintagel Castle in Cornwall, England, United Kingdom, a secular, high status settlement of Sub-Roman Britain.
Split into simpler sentences: The Artognou stone, sometimes incorrectly referred to as the Arthur stone, is an archaeological artifact uncovered in Cornwall, England, United Kingdom. It was discovered in 1998 in securely dated sixth-century contexts among the ruins at Tintagel Castle in Cornwall, a secular, high status settlement of sub-Roman Britain.