1、Pleas for help were made to the public,and the money came

1、roll in是个固定搭配,指大量涌进,尤指钱财.这句话是说因为向公众求助,所以收到大量欠款,后半句中money came是主谓语,rolling in 是分词短语作状语.你选的rolled back,是“被转回去”,无论语法还是意义都不符合这句话的要求.
2、这句话要从there be结构的起源说起,there be句型其实是...be there的特殊形态.这句话里dream of 后边需要接个名词或动名词短语,如果我把句子这样写,你是不是就好理解了：
I never dreamed of such a quiet place in the noisy city being there.
如果理解不了这种解释,就死记硬背一下“介词后面除了接名词、动名词外还可以接there being...”就好了,因为难解释的其实就这一条.