Complex sentence: Excavations of the site took place in 1857 and 1860, during which many extremely well crafted structural fragments were recovered, now in the "Kulturhistorisk Museum" ("Museum of Cultural History"), now part of Bergen Museum.
Split into simpler sentences: Excavations of the site took place in 1857 and 1860, during which many extremely well crafted structural fragments were recovered. These artifacts are now in the Museum of Cultural History ("Kulturhistorisk Museum"), part of Bergen Museum.