The Use Of "And" In Certain Situations

Hi, everyone.

I am unsure of the rules regarding the use of “and” in certain circumstances.
For example:

“Chris went to the shop to get bread and then he drove home.”

In this sentence, when you get to the point where it says “then he drove home” you are expecting another item in the list. In my mind, you are expecting something like:

“Chris went to the shop to get bread and milk.”

I realise the original example should probably be something like:
“Chris went to the shop to get bread, and then he drove home.”

However, I would like to know if there are any rules or guidelines for this sort of thing.

Any help would be appreciated.