Complex sentence: The Oak Ridges Moraine, is a geological landform that runs east-west across south central Ontario, Canada, developed about 12,000 years ago, during the Wisconsin glaciation in North America.
Split into simpler sentences: The Oak Ridges Moraine is a geological landform that runs east-west across south central Ontario, Canada. It developed about 12,000 years ago, during the Wisconsin glaciation in North America.