No, but if the code is fully available, you can do some refactoring and cleaning up to better understand what's going on. Usually, just cleaning up the code and documenting each section using comments makes it easier to understand. Also, you can use the Edit>>Create SubVI option to encapsulate pieces of the code into VIs to make it easier to read.
Just note that all this requires being careful so that you don't change the functionality of the code.
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