Complex sentence: Between 1809 and 1839, exports tripled from £25 million to £76 million, while imports nearly doubled from £28 million to £52 million during the same period; by 1849, exports were £124 million and imports were £79 million.
Split into simpler sentences: Between 1809 and 1839, exports tripled from £25 million to £76 million, while imports nearly doubled from £28 million to £52 million during the same period. By 1849, exports were £124 million and imports were £79 million.