Maltodextrin is a complex carbohydrate derived from starch. It is released slowly into the bloodstream. This keeps energy levels high for your entire workout without the extra amounts being stored as fat.

it is complex to a degree, but it does raise insulin quite a bit.

So if it does release a lot of insulin,can i take it after my workouts? Or would dextrose still be the best choice?

dextrose is definately a better choice if you are concerned with raising insulin levels