请教，这个句子中的这个成分是什么？

句子如下：
The government is to ban payments to witnesses by newspapers seeking to buy up people involved in prominent cases such as the trial of Rosemary West.
在此，有个地方不明白。seeking to buy up people involved in prominent cases such as the trial of Rosemary West.在句子之中做什么成分，难道是做状语，修饰newspapers，似乎又不通，还是newspapers seeking to buy up people involved in prominent cases such as the trial of Rosemary West 作为一个成分，组成独立主格结构。
在此，希望能得到高手的指点。提前谢谢大家了。

不用大家费心了。我正明白了。

什么意思，不明白