Complex sentence: Stephen Russell Reed, the longest-serving mayor of Harrisburg, Pennsylvania, was born in 1950, in Carlisle, Pennsylvania, and moved with his parents to Harrisburg, Pennsylvania as a young man.
Split into simpler sentences: Stephen Russell Reed (1950 --) is the current and longest-serving mayor of Harrisburg, Pennsylvania. He was born in Carlisle, Pennsylvania, and moved with his parents to Harrisburg as a young man.