Complex sentence: With a gross revenue of USD 45 billion (in 2014) it is the third-largest Indian private sector conglomerate behind Tata Group with revenue of just over US $100 billion and RIL with revenue of US $74 billion.
Split into simpler sentences: With a gross revenue of USD 45 billion (in 2014). It is the third-largest Indian private sector conglomerate behind Tata Group with revenue of just over US $100 billion and RIL with revenue of US $74 billion.