It's a long story.

说来话长.

《现代汉英综合大词典》

It's a long story so I'll boil it down.

要说的话太多,所以我就长话短说.

辞典例句

It's a long story, but to put it in a nutshell, he has been arrested.

这事说来话长, 不过简言之, 他已被捕.

辞典例句

It's a long story. Valentine is a priest. People celebrate that day in memory of him.

这说来可就话长了. Valentine是个牧师, 人们庆祝那天是为了纪念他.

地道口语脱口SHOW 高中超越版

It's a long story but the things you just said really made my day!

说来话长,但你刚说的话使我重新振作!

电影对白

Wang Ping: It's a long story.

王平: 说起来话长了.

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