It's a complex issue, but he only sees it in black and white.

那是个复杂的问题，但他却只看到对与错的分别。

《牛津词典》

This is a complex issue and we need to take it seriously.

这是一个复杂的问题，我们需要认真对待。

youdao

It's a complex issue, and I should leave it having said this much, at least for the moment.

这是一个复杂的问题，我应该先说这么多，至少暂时这样。

youdao

That sounds simple. But the issue is a complex mix of technical,business, political and legal questions.

VOA: special.2009.09.25

So it's a complex issue, and I should leave it having said this much, at least for the moment.

因此它是一个很复杂的问题，而我就讲到这里，至少暂时这样。

耶鲁公开课 - 文学理论导论课程节选

We can already use that in terms of single ions to think about a really complex biological issue, which is to talk about ion channels.

我们已经能够仅仅凭借这个关于单个离子的原理,来讨论一个非常复杂的生物问题了，我们要讨论的就是离子通道。

麻省理工公开课 - 化学原理课程节选

And it is a complex issue, indeed, as I will discuss in my next eBook post.

FORBES: eBook Evolutions: Publishers

Obama says the misinformation confuses people over an already complex issue that requires public understanding.

CNN: Rumors influencing health care debate

But as you know, this is a complex issue and that requires complex solutions.

WHITEHOUSE: Press Briefing by Press Secretary Jay Carney,