Zhè jiàn shì shuōláihuàchánɡ.
这件事说来话长。
It's a long story.
Notes:
这(Zhè): this
件(jiàn): measure word for thing
事(shì): thing
说来话长(shuōláihuàchánɡ): a long story to tell
Example:
A: 昨天发生了什么事?
     Zuótiān fāshēnɡ le shénme shì?
     What happened yesterday?
B:这件事说来话长。
     Zhè jiàn shì shuōláihuàchánɡ.
     It's a long story.
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