Complex sentence: The Imperial Mammoth ("Mammuthus imperator") was the largest known species of North American mammoth, and the second largest mammoth overall, reaching a height of 4.9 m (16 ft) at the shoulder.
Split into simpler sentences: The Imperial Mammoth ("Mammuthus imperator") was the largest known species of North American mammoth, and the second largest mammoth overall. Reaching a height of 4.9 m (16 ft) at the shoulder.