Complex sentence: Though the first Advent Christian Association was founded in Salem, Massachusetts, in 1860, the church's formation is rooted in the Adventist teachings begun by Baptist preacher William Miller of Pittsfield, Massachusetts.
Split into simpler sentences: Though the first Advent Christian Association was founded in Salem, Massachusetts, in 1860. The church's formation is rooted in the Adventist teachings begun by Baptist preacher William Miller of Pittsfield, Massachusetts.