It's quite simple really. The first line is the key.

其实说来非常简单，第一句就是关键。

youdao

The answer is really quite simple.

实际上答案相当简单。

《牛津词典》

The idea is really quite simple.

这个想法实际上非常简单。

youdao

Let me start out by putting what I think is a relatively controversial proposition on the table and that's that this investment management business, when stripped down to its bare essentials, is really quite simple.

让我从一个,相对争议的话题开始,投资管理业务,当剥离种种表象追溯到其本质时,其实非常简单

耶鲁公开课 - 金融市场课程节选

"It's quite simple really, " said Hamilton, who only needs to finish fifth to capture the championship even if Massa wins.

BBC: Relaxed Hamilton ignores pressure

Quite simple really, but I remained fascinated by the subject and a number of years ago I went along to the Lawn Tennis Association to examine the records of top tennis players.

BBC: The sinister tale of left handers

And what I tell people is really quite simple.

CNN: Transcript of June 'CNN Money Summit: Money & Main St.'