Complex sentence: The FIRA-Association Européenne de Rugby (FIRA--AER) was formed in 1999 to promote, develop, organise and administer the game of rugby in Europe under the authority of the International Rugby Board (the world governing body of rugby union).
Split into simpler sentences: The FIRA-Association Européenne de Rugby (FIRA--AER) is the administrative body for rugby union in Europe. It was formed in 1999 to promote, develop, organise and administer the game of rugby in Europe under the authority of the International Rugby Board (the world governing body of rugby union).