Complex sentence: The entire area was ringed with camouflaged anti-aircraft batteries, constructed first to deflect suspicion about the importance of the site, communicated to locals as an expansion of the air defense zone of Bad Münstereifel.
Split into simpler sentences: The entire area was ringed with camouflaged anti-aircraft batteries, constructed first to deflect suspicion about the importance of the site. The locals were told that it as an expansion of the air defense zone of Bad Münstereifel.