Complex sentence: At present, the largest and the most commonly seen mammal is the Sambar Deer Deer to be around 1500 to 2000, possibly more than the carrying capacity of the plains.
Split into simpler sentences: At present, the largest and the most commonly seen mammal is the Sambar Deer. Some research findings estimate the population of Sambar Deer to be around 1500 to 2000, possibly more than the carrying capacity of the plains.