Complex sentence: Barratt's Chapel is the oldest surviving church building in the United States built by and for Methodists, but it earns its title as the "Cradle of Methodism" because of what happened there in 1784.
Split into simpler sentences: Barratt's Chapel is the oldest surviving church building in the United States built by and for Methodists. But it earns its title as the "Cradle of Methodism" because of what happened there in 1784.