Complex sentence: Britain's growth rate, manufacturing output and GDP (but not GDP per capita) fell behind its rivals, the United States and Germany but the nation still led the world in trade, finance and shipping, and had strong bases in manufacturing and mining.
Split into simpler sentences: Britain's growth rate, manufacturing output although the GDP (but not GDP per capita) fell behind its rivals, the United States and Germany. The nation still led the world in trade, finance and shipping, and had strong bases in manufacturing and mining.