Complex sentence: Siyouma's dam Sichilla showed great promise in a brief racing career, winning two of her three races including the Listed Prix Amandine, and as a broodmare, she also produced Siyouni, a colt who won the Prix Jean-Luc Lagardere in 2007.
Split into simpler sentences: Siyouma's dam Sichilla showed great promise in a brief racing career, winning two of her three races including the Listed Prix Amandine. As a broodmare, she also produced Siyouni, a colt who won the Prix Jean-Luc Lagardere in 2007.