I'm reading this article, and I can't understand how the word "shown" function.
"
http://www.independent.co.uk/news/world/video-captures-explosive-volcanic-eruption-in-papua-new-guinea-9716165.html"
Here is the sentence from that article I want to ask about:
"Incredible footage of a volcanic eruption [shown] sending a powerful shockwave rippling through the clouds above it has been captured by a holidaymaker."
If I can get rid of the word, I think I can understand the sentence, but with that word, I can't understand that sentence well.
How does that word [shown] function?
Could you tell me?
Thanks in advance.