Complex sentence: York Haven Dam is a low head, run of the river dam and hydroelectric plant on the Susquehanna River located south Harrisburg, Pennsylvania, at the Conewago Falls, where the river drops 19 feet in 1/4 mile.
Split into simpler sentences: York Haven Dam is a low head, run-of-the river, dam and hydroelectric plant on the Susquehanna River. The dam is south of Harrisburg, Pennsylvania, at the Conewago Falls, where the river drops 19 feet in 1/4 mile.