Complex sentence: The race's recent history has been dominated by Henrietta Knight, who won eight of the ten runnings between 1998 and 2007 with four different horses, including four consecutive victories with Edredon Bleu.
Split into simpler sentences: The race's recent history has been dominated by Henrietta Knight, who won eight of the ten runnings between 1998 and 2007. This was achieved with four different horses, including four consecutive victories with Edredon Bleu.