As families move away from their stable community, their friends of many years, their extended family relationships, the informal flow of information is cut off, and with it the confidence that information will be available when needed and will be trustworthy and reliable.
我觉得你这个句子分析还是欠准确,呵呵。the informal flow of information is cut off应该是句子的主干。and with it the confidence 应该是作状语,