Complex sentence: Along with his wife, Kris Tompkins, he bought and conserved over of wilderness in Chile and Argentina, more than any other private individual in the region becoming one of the the largest private land-owners in the world.
Split into simpler sentences: Along with his wife, Kris Tompkins, he bought and conserved over of wilderness in Chile and Argentina, more than any other private individual. He was one of the largest private land-owners in the world.