Complex sentence: The André-Mathieu Club was founded in 1942 at Trois-Rivières by Mme Anaïs Allard-Rousseau to promote an interest in music among the young, later became part of the Youth and Music Canada (YMC) or Jeunesses musicales du Canada (JMC).
Split into simpler sentences: The André-Mathieu Club was founded in 1942 at Trois-Rivières by Mme Anaïs Allard-Rousseau to promote an interest in music among the young. The club eventually became part of the Youth and Music Canada (YMC) or Jeunesses musicales du Canada (JMC).