What do the words in bold “who” (l. 04) and “he” (l. 29) ref...

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The secret history of Stonehenge




(Available at: https://www.nationalgeographic.com/history/article/stonehenge-1 – text specially adapted for this test). 
What do the words in bold “who” (l. 04) and “he” (l. 29) refer to, respectively? 
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