Complex sentence: The game had been generating advertising revenue of over $25,000 a month for the Agarwalla brothers, however they refused to sell their application to Hasbro, instead requesting a "multiple" of $10 million.
Split into simpler sentences: The game had been generating advertising revenue of over $25,000 per month for the Agarwalla brothers. The Agarwallas refused to sell their application to Hasbro, instead requesting a "multiple" of $10 million.