Complex sentence: Project directors Joseph Opala and Gary Chatelain at James Madison University are producing a 3-D image of the castle using computer-aided design, which allows the viewer to "enter" all the structures and "see" them as they appeared 200 years ago.
Split into simpler sentences: Project directors Joseph Opala and Gary Chatelain at James Madison University are producing a 3-D image of the castle using computer-aided design. It will allow the viewer to "enter" all the structures and "see" them as they appeared 200 years ago.