Complex sentence: Implications for Understanding Present-day Biodiversity The low precipitation was caused by the Laurentide Ice Sheet, an ice sheet covering much of Canada, and parts of the northern United States in the midwest and east.
Split into simpler sentences: Implications for Understanding Present-day Biodiversity The Laurentide Ice Sheet had a major effect on the climate. The Laurentide Ice Sheet was an ice sheet covering much of Canada, and parts of the northern United States in the midwest and east.