Complex sentence: For centuries, possibly thousands of years, these small horses have lived wild in the harsh environment of the wetlands of the Rhone delta, the Camargue marshes, developing the stamina, hardiness and agility for which they are known today.
Split into simpler sentences: For centuries, possibly thousands of years, these small horses have lived wild in the harsh environment of the Camargue marshes, wetlands of the Rhone delta. They developed the stamina, hardiness and agility for which they are known today.