of assuring that the resources are well managed 是来解释补充这个burden的啊,你指的原句是把这句复合句分开开成两句简单句么?
The main burden falls on the boss in the company.
The main burden is assuring that the resources are well managed.
这句话没有原来语序,如果不是分成两个句子,就只能按现在这样放,因为那个所谓的分割成分就是在解释burden.
如果硬要改的话,可以改成The main“assuring that the resources are well managed”burden falls on the boss in the company.这样是把那部分提上来作前置定语,但是这样很拖沓很繁冗,基本上是不这样讲的