Complex sentence: Though born an infant of normal size into a family of normal-sized people in Letcher County, Kentucky, the Guinness Book of World Records and other reputable sources have him listed at being tall and weighing.
Split into simpler sentences: Though born an infant of normal size into a family of normal-sized people in Letcher County, Kentucky, he is said to at one time have been in height. The Guinness Book of World Records and other reputable sources have him listed at being tall and weighing.