Complex sentence: Idemitsu first started to work in the United States initially with 8 mm film moving onto 16 mm film, she became interested in capturing the mood, quality and interplay of light and shadow.
Split into simpler sentences: Idemitsu first started to work in the United States initially with 8 mm film and then moving onto 16 mm film. She became interested in capturing the mood, quality and interplay of light and shadow.