Simplify the following text for a Grade 11 native English-speaking person.
Original: LÃ on Theremin is the subject of the feature length documentary film , Theremin : An Electronic Odyssey , written , directed , and produced by Steven M. Martin .
Simplified: LÃ on Theremin is the subject of the documentary film , Theremin : An Electronic Odyssey , written , directed , and produced by Steven M. Martin .