Complex sentence: During the war years, the College became an academy, operating as Catawba High School from 1865 until 1885, whereupon it resumed operations under its original charter as Catawba College.
Split into simpler sentences: During the war years, the College became an academy, operating as Catawba High School from 1865 to 1885. In the latter year, it resumed operations under its original charter as Catawba College.