Complex sentence: The Liberals maintained a strong showing in 2004, however, in 2006, their margin of victory shrunk considerably, with the Conservatives managing a surprisingly strong second, more than doubling their 2004 percentage.
Split into simpler sentences: The Liberals maintained a strong showing in 2004, however, in 2006, their margin of victory shrunk considerably. The Conservatives managed a surprisingly strong second, more than doubling their 2004 percentage.