Complex sentence: India has a population of feral dogs numbering in the tens of millions, the highest in the world; and millions of people are bitten every year, with about 20,000 people dying annually from rabies.
Split into simpler sentences: India has a population of feral dogs numbering in the 10s of millions, the highest in the world. Millions of people are bit every year with about 20,000 people dying annually from rabies.