Original sentence: Fallout shelters, both private and public, were built, but the government still viewed it as necessary to explain to citizens both the danger of the atomic (and later, hydrogen) bombs, and to give them some sort of training so that they would be prepared to act in the event of a nuclear strike
Edited sentence: Fallout shelters, both private and public, were built, but it was still necessary to explain to citizens both the danger of the atomic (and later, hydrogen) bombs, and to give them some sort of training so that they would be prepared to act in the event of a nuclear strike