Complex sentence: The white-footed mouse ("Peromyscus leucopus") is a rodent native to North America from Ontario, Quebec, Labrador, and the Maritime Provinces (excluding island of Newfoundland) to the southwest USA and Mexico.
Split into simpler sentences: The white-footed mouse ("Peromyscus leucopus") is a rodent native to North America. It ranges from Ontario, Quebec, Labrador and the Maritime Provinces (excluding island of Newfoundland) to the southwest USA and Mexico.