Complex sentence: Macalester's positive reputation grew during the 1960s, when it consistently drew many National Merit Scholars, enough to come in at the country's top ten; during this time the college also benefitted heavily from DeWitt Wallace's success with Reader's Digest.
Split into simpler sentences: Macalester's positive reputation grew during the 1960s, when it consistently drew many National Merit Scholars, enough to come in at the country's top ten. During this time the college also benefitted greatly from DeWitt Wallace's success with Reader's Digest.