Complex sentence: Reese became a coal miner and then roller's helper at Jones & Laughlin Steel in Pittsburgh, Pennsylvania, and moved to Youngstown, Ohio, where he took a job at the Brown-Bonnell Mills.
Split into simpler sentences: Reese became a coal miner and then roller's helper at Jones & Laughlin Steel in Pittsburgh, Pennsylvania. He later moved to Youngstown, Ohio, where he took a job at the Brown-Bonnell Mills.