Complex sentence: The 2005 race, renamed the North American Solar Challenge, the longest and most hotly contested race so far, covered 2494.9 miles, taking the teams from Austin, TX, USA to Calgary, Alberta, Canada.
Split into simpler sentences: The 2005 race, renamed the North American Solar Challenge, was the longest and most hotly contested race so far. The route covered 2494.9 miles, taking the teams from Austin, TX, USA to Calgary, Alberta, Canada.