Complex sentence: The Vikings conducted summer training camp at Bemidji State University from 1961 to 1965, but in 1966, they moved their training camp to Minnesota State University in Mankato, where it remains to this day.
Split into simpler sentences: The Vikings conducted summer training camp at Bemidji State University from 1961--65. In 1966, they moved their training camp to Minnesota State University in Mankato, where it remains to this day.