Out of the box is not possible to store the address on 2 separate fields.
And I also don't recommend you to try to implement such a system. You can get in a lot of troubles. There are a lot of places where you need to do modifications.
What I suggest is to split the value for the street by \n
(new line) and get only the part that you want.
This is how Magento stores the street name in the db. it merges the lines and separates them by 'new line'.