Complex sentence: The project became dear to Hyun Jung-hwa's heart and reflecting her enthusiasm, she and other players active at the time, put in painstaking efforts to make every scene and detail as authentic as possible.
Split into simpler sentences: The project became dear to Hyun Jung-hwa's heart. Reflecting her enthusiasm, Hyun, as well as other players active at the time, put in painstaking efforts to make every scene and detail as authentic as possible.