Complex sentence: Three weeks later, Ryu learns from his doctor that a kidney has been found for his sister and that the operation will cost 10,000,000 won, but since the organ dealers stole his money, he won't be able to pay for it.
Split into simpler sentences: Three weeks later, Ryu learns from his doctor that a kidney has been found for his sister and that the operation will cost 10,000,000 won. But, since the organ dealers stole his money, he won't be able to pay for it.