Complex sentence: The original Spanish "jaca" was probably a cross between the Celtic Pony and the Camargue; it was later improved further by crosses with northern European horse types and ultimately with the southern peninsular horse as the Moors spread their influence towards the Pyrenees.
Split into simpler sentences: The original Spanish "jaca" was probably a cross between the Celtic Pony and the Camargue. It was later improved further by crosses with northern European horse types and ultimately with the southern peninsular horse as the Moors spread their influence towards the Pyrenees.