麻烦谁能帮分析下句子成分啊?

题目

麻烦谁能帮分析下句子成分啊?
Of major concern to Amtrak and its advertising agency DDB Needham,were the long-distance western routes where ridership had been declining significantly.
这句话原文是
Amtrak(美国铁路客运公司) was experiencing a downswing in ridership(客运量) along the lines comprising its rail system.Of major……declining significantly.

答案

这是一个倒装句,还原后应该是
the long-distance western routes where ridership had been declining significantly were of major concern to Amtrak and its advertising agency DDB Needham.