Complex sentence: Shortly afterwards a Welsh service commenced in Gravel Lane, Borough, as a branch of Wilderness Row, but later a split came between the two congregations when Gravel Lane became completely Congregational and Wilderness Row completely Methodist.
Split into simpler sentences: Shortly afterwards a Welsh service commenced in Gravel Lane, Southwark, as a branch of the Wilderness Row congregation. A split came between the two congregations when Gravel Lane became completely Congregational and Wilderness Row completely Methodist.