Complex sentence: Arjuna (pronounced in classical Sanskrit) is the third of the Pandava brothers, who, with Krishna is considered the main hero of "Mahabharata", in which he plays a key role in the Bhagavad Gita.
Split into simpler sentences: Arjuna (pronounced in classical Sanskrit) is the third of the Pandava brothers. He, with Krishna is considered the main hero of "Mahabharata", and plays a key role in the Bhagavad Gita.