Complex sentence: The 2004 finals were once again held at the Futuroscope, roughly 400 finalists from 41 countries attended to compete for a €210,000 prize purse.
Split into simpler sentences: The 2004 finals were once again held at the Futuroscope. Roughly 400 finalists, from 41 countries, attended to compete for a €210,000 prize purse.