Complex sentence: Over the course of their construction, 10 facilities to house 150 people were built, an additional 10 for housing 100 men, and 45 for housing 70 men at a total of 65 SAC bases or other USAF bases where a SAC wing was a tenant command.
Split into simpler sentences: Over the course of their construction, 10 facilities to house 150 people were built. These were supplemented by an additional 10 facilities for housing 100 men, and 45 facilities for housing 70 men at a total of 65 SAC bases or other USAF bases where a SAC wing was a tenant command.