Complex sentence: The first French Spaniel is speculated to have appeared following the Crusades of the 11th Century, and it was these breeds of dogs that were described in Gaston III of Foix-Béarn's 14th Century work "Livre de Chasse".
Split into simpler sentences: The first French Spaniel is speculated to have appeared following the Crusades of the 11th Century. It was these breeds of dogs that were described in Gaston III of Foix-Béarn's 14th Century work "Livre de Chasse".