Yídàn nǐ mínɡbɑi, jiù huì hěn jiǎndān.
一旦你明白,就会很简单。
It's easy once you know how.
Notes:
一旦(yídàn): once
你(nǐ): you
明白(mínɡbɑi): understand
就(jiù): just
会(huì): will
很(hěn): very
简单(jiǎndān): easy
Example:
A:为什么我不明白?
Wèishénme wǒ bù mínɡbɑi?
Why don't I understand?
B:一旦你明白,就会很简单。
Yídàn nǐ mínɡbɑi, jiù huì hěn jiǎndān.
It's easy once you know how.