Complex sentence: The World Travel & Tourism Council (WTTC) is a business leaders' forum for travel and tourism and is composed of Chairmen and Chief Executives of 100 of world organisations, representing all regions and sectors of the industry.
Split into simpler sentences: The World Travel & Tourism Council (WTTC) is a forum for the travel and tourism industry. The WTTC is composed of chairmen and chief executives of international travel and tourism companies, representing different regions and sectors of the industry.