Complex sentence: Born Roy Linn Atherton, in Pearl, Illinois, to William Er. and Eva (Ward) Atherton, he grew up on the family farm until enlisting in the United States Army Air Corps.
Split into simpler sentences: Born Roy Linn Atherton, in Pearl, Illinois, to William Er. and Eva (Ward) Atherton. Atherton grew up on the family farm in Pearl, Illinois, until enlisting in the United States Army Air Corps.