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You can use Pathfinder tools to cut the stroke shape through the original source path once everything is expanded. If the stroke expands in some unpredictable manner, such as it consumes the original source path, you can undo the operation. To have total control you can select and copy the source path with the not yet expanded stroke to the clipboard for safe keeping. The path that's still visible on the art board can have its stroke expanded. Pathfinder operations can make the expanded stroke cut through the source path. If something goes wrong the back-up path saved in the clipboard can be pasted in place.
Depending on the kind of output, it might not be a good thing to make the expanded stroke cut through the path. In various kinds of print output a certain level of trapping is needed to avoid tiny gaps showing at the object edges. The original source path will be running along the center line underneath the object's stroke. If you have the expanded stroke simply resting above the source path, with no cutting involved, you'll retain a kind of trapping for print output.
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Draw 2 lines where you want to cut the shape, then select all objects and click on Divide from the pathfinder panel
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That white line is a shape itself.
Please show the complete object and tell us exactly in which way you want to cut it.
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Kyle,
As I (mis)understand it, Bobby has given the full answer, both to the way to cut/trim as described and to the considerations that may call for another solution.
Concerning the way to cut, I agree that the white path has obviously been made with a stroke and no fill originally, and that is why it needs to be outlined/expanded unless already so that it has a fill and no stroke in order to trim as you describe; then you can use the Subtract from Shape Area in the Pathfinder Panel,
https://helpx.adobe.com/illustrator/using/combining-objects.html#pathfinder