Now congress, in apparent agreement, has required by law that businesses awarded federal contracts of more than $50000 do their best to find minority subcontractors and record their efforts to do so on forms filed with the government,(大全１／６４）

请帮忙分析一下这个句子啊虽然我能理解这个句子要表述的意思可是觉得有些表达不是很顺畅比如说by law 的位置，比如business awarded federal contracts of more than $50000在awarded后面的部分是用来做后置定语修饰business 的吗？总感觉少了些东西,还有effort to do so 和on forms filed with 也不是特符合我的语言习惯．