Complex sentence: Refn later claimed that the thieves tended to be overly committed to the realism of the scene, and also that he suspected they were using the opportunity to plan a real robbery of the dealership after filming had completed.
Split into simpler sentences: Refn later claimed that the thieves tended to be overly committed to the realism of the scene. He also suspected that they were using the opportunity to plan a real robbery of the dealership after filming had completed.