Complex sentence: The Land on which JFK Prep was built on is the former Oschwald Foundation founded by Fr. Ambrose Oschwald in 1854, which was the year that the first colonists arrived in St. Nazianz, Wisconsin and began clearing land and building houses.
Split into simpler sentences: The land on which JFK Prep was built on is the former Oschwald Foundation founded by Fr. Ambrose Oschwald in 1854. That was the year that the first settlers arrived in St. Nazianz and began clearing land and building houses.