"..., 后来..." (..., hòulái...) is used to sequence past events in the same way that "Afterward..." is in English. Something very important to note is that 后来 can only be used with two events that have already occurred in Chinese grammar.
Structure
past event #1 +后来+past event #2
Examples
Here are some examples of this pattern in action:
Tā zuótiān chī le hǎi xiān, hòu lái tā shí wù zhònɡ dú le.
她 昨天 吃 了 海鲜，后来 她 食物 中毒 了。
她 昨天 吃 了 海鲜，后来 她 食物 中毒 了。
She ate seafood yesterday, but then she got food poisoning.
