Complex sentence: Officer candidates were expected to be college gradates, or to have completed two years of college, and have at least two years of acceptable business or professional experience, and be between the ages of 20 and 50 years.
Split into simpler sentences: Officer candidates were expected to be college gradates, or have completed two years of college and have at least two years of acceptable business or professional experience. And they had to be between the ages of 20 and 50 years.