(OP) Chris , it is not saying “ we went into a large hall, where we found a statue”, - it is saying “we went into a large hall, in the middle of which there was (located/found) a statue “ . The verb se trouver - to be (in a place)/located/‘found’ eg « la maison se trouve au coin de la rue »
The entry is a singular happening in the past, hence passé composé. The bit about the statue is describing a state, hence imperfect.
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