Complex sentence: The Alternate Processing and Correlation Center (APCC) in the Offutt AFB Underground Command Complex provides an alternate missile warning correlation center to Cheyenne Mountain... and is the prime source of missile warning data for USSTRATCOM for force survival and force management.
Split into simpler sentences: The Alternate Processing and Correlation Center (APCC) in the Offutt AFB Underground Command Complex provides an alternate missile warning correlation center to Cheyenne Mountain. It is the prime source of missile warning data for USSTRATCOM for force survival and force management.