Complex sentence: The World Cup races in North America were switched to the early part of the season in November 1996 and the men's speed events at Whistler were canceled due to weather three straight years, prompting the switch to Lake Louise in Alberta in December 1999.
Split into simpler sentences: The World Cup races in North America were switched to the early part of the season in the fall of 1996, and the men's speed events at Whistler were canceled three straight years due to weather. This prompted the switch to Lake Louise in Alberta in December 1999.