Complex sentence: The Chautauqua Movement began in 1874 in at Lake Chautauqua, New York, founded by John Heyl Vincent and Lewis Miller in the Methodist-Unitarian movement as an "outdoor Sunday School" to encourage religion and learning as an optimistic experience.
Split into simpler sentences: The Chautauqua Movement began in 1874 at Lake Chautauqua, New York. It was founded by John Heyl Vincent and Lewis Miller in the Methodist-Unitarian movement as an "outdoor Sunday School" to encourage religion and learning as an optimistic experience.