Complex sentence: One of these finds dated a few centuries B.C. ranks as important; in 1837 soldiers who were quartered here (Belgian war of Independence) dug up burial mounds (Celtic urns).
Split into simpler sentences: One of these finds, dated a few centuries B.C., ranks as important. In 1837, soldiers who were quartered here (Belgian war of Independence), dug up burial mounds (Celtic urns).