Complex sentence: Discovered at the end of 17th century and commonly considered to be a nuragic site, the inhabited centre of huts, built with small stones joined together by mud, was for a long time inhabited also in the Roman and Medieval ages.
Split into simpler sentences: Discovered at the end of 17th century is commonly considered to be a nuragic site. The inhabited centre of huts, built with small stones joined together by mud, was for a long time inhabited even in the Roman and Medieval ages.