Complex sentence: Bogdanovich thought she would be good as any one of them and decided he wanted her in the picture so let her choose, and she chose to be Jacy's mother because she thought the part interesting.
Split into simpler sentences: Bogdanovich thought she would be good as any one of them and decided he wanted her in the picture for any role she selected. She chose to be Jacy's mother because she thought the part interesting.