Complex sentence: After seeing a girl in a magazine picture of young ballet dancers in New York City who looked like one of his missing daughters, Betty, he drove all the way to the girl's school, where his repeated demands to see the girl himself were refused.
Split into simpler sentences: After seeing a girl in a magazine picture of young ballet dancers in New York City who looked like one of his missing daughters, Betty. He drove all the way to the girl's school, where his repeated demands to see the girl himself were refused.