How to say "After +Verb" in Chinese?
'After' can be expressed with 以后 placed after the clause:

吃完糖果以后，我去那里。

The second sentence can be translated using an 'after', e.g.:

他看到你来以后，他离开了。But it would sound 'more natural' if you dropped it:

他看到你来，就离开了。