Complex sentence: A man named James Friar, who had been a patient at the Womack Army Hospital on post, escaped from the hospital that night and tried to call his doctor, who also happened to be named MacDonald.
Split into simpler sentences: A man named James Friar had been a patient at the Womack Army Hospital on post. He had escaped from the hospital that night and tried to call his doctor, who also happened to be named MacDonald.