Complex sentence: In December 1887, President Grover Cleveland, a Democrat, devoted his entire State of the Union Address to the issue of the tariff and called emphatically for the reduction of duties and the abolition of duties on raw materials.
Split into simpler sentences: In December 1887, President Grover Cleveland, a Democrat, devoted his entire State of the Union Address to the issue of the tariff. He called emphatically for the reduction of duties and the abolition of duties on raw materials.