"Thought to have been lived in between about 5,500 and 3,300 years ago, the site caused a stir when discovered in 2002 because it revealed a previously unknown ancient society now called the Mayo Chinchipe culture."
(The Guardian.)
Is "the site" a subject of the non-finite clause Thought to have been lived in between about 5,500 and 3,300 years ago?
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The group of words "thought to have been lived in between about 5,500 and 3,300 years ago" has an adjectival function in the sentence and modifies "site." Rearranging the word order makes this clear:
"The [thought to have been lived in between about 5,500 and 3,300 years ago] site caused a stir when discovered in 2002 because it revealed a previously unknown ancient society now cal