the mid-1980s brought one inquiry after another i

题目

the mid-1980s brought one inquiry after another i
nto the causes of America's industrial decline.求大神翻译并划分句子成分!

答案

上世纪80年代中叶,（有关方面）对美国工业衰退的起因展开了一系列的调查.
这是个简单句,成分有什么问题?