Complex sentence: Pennsylvania Dutch Country refers to an area of southeastern Pennsylvania that by the American Revolution had a high percentage of Lutheran, German Reformed, Moravian, Amish, Mennonite and other German sectarian inhabitants and where the Deitsch language was historically common.
Split into simpler sentences: Pennsylvania Dutch Country refers to an area of southeastern Pennsylvania that by the American Revolution had a high percentage of Lutherans. There were also German Reformed, Moravian, Amish, Mennonite and other German sectarian inhabitants and where the Deitsch language was historically common.