Complex sentence: The Lexington, Kentucky Marshals office's jurisdiction includes Harlan County (a hopelessly impoverished, backwoods coal-mining community in southeastern Kentucky), in which Raylan grew up and thought he had escaped for good, in his youth.
Split into simpler sentences: The Lexington, Kentucky Marshals office's jurisdiction includes Harlan County (a hopelessly impoverished, backwoods coal-mining community in southeastern Kentucky), in which Raylan grew up. Raylan thought he had escaped for good, in his youth.