Is there any research or automated process to translate OOP code to either "better" one, imperative code or some intermediate form?

I do not think that this question is well formed to ask on the main site. I get large codebase periodically, the quality is poor, because it is OOP from name, in fact these are simple containers that violate OOP paradigm, so "better" effectively means standard or some form (any would do). I couldn't find any paper about automatic transformation.