Complex sentence: Le Havre Athletic Club Football Association or Havre Athletic Club, is a French football, originally an athletics and rugby club based in Le Havre, founded in 1872 making it the oldest association football and rugby club registered in France.
Split into simpler sentences: Le Havre Athletic Club Football Association (commonly referred to as Le HAC, HAC, or simply Le Havre) is a French association football club based in Le Havre. The club was founded originally as an Athletics and rugby club in 1872, thus making it the oldest association football and rugby club registered in France.