Question

explain these lines.
'a shelter they built with their own hands amidst the rubble'
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Answer 1

These lines refer to the kids Lucia, Nicola and Jacopo. After the war had destroyed their home and killed their father, the three of them built a small shelter for themselves using the broken remains lying around.

Answer 2

Rubble' means fragments of stones and debris caused due to demolition of buildings. 
Amidst is a preposition .. the real word is amid which means surrounded by.

So the sentence means They built a shelter with their own hands around the rubble.