Complex sentence: Minnesota played a host to four major ice advances during the Pleistocene ice age, named, from the oldest to the youngest, Nebraskan, Kansan, Illinoian, and Wisconsin.
Split into simpler sentences: Minnesota played a host to four major ice advances during the Pleistocene ice age. Named from the oldest to the youngest, they are the Nebraskan, Kansan, Illinoian, and Wisconsin.