    Sentence’ 1:.Wiat» tine ‘period: did: the geoglyphs, date  back to?    Senténce 2: The’ BBC's Unnatural. Histories” presents  evidence ‘that .Oréllana, “rather ‘than “exaggerating. his  lains “as previously thought,” was corrett « in his  observations * ‘that a” complex” civilization’ was  Ftouirishing’ along the :Anazon in the 1540s.         