Complex sentence: One family of twelve were the nearest people, living at Nurrari Lakes less than 200km west from Maralinga-they were close enough to hear the larger bombs explode, but were otherwise healthy several years after the tests.
Split into simpler sentences: One family of twelve were the nearest people, living at Nurrari Lakes less than 200km west from Maralinga. Although close enough to hear the larger bombs explode, they were healthy several years after the tests.