Complex sentence: To compensate the people who originally developed the intellectual property that led to the creation of the drugs that they sell, pharmaceutical companies pay about $10 billion annually in the form of royalties, typically some percentage of the revenues created by the drug in question.
Split into simpler sentences: To compensate the people who originally developed the intellectual property that led to the creation of the drugs that they sell, pharmaceutical companies pay about $10 billion annually in the form of royalties. The royalties typically consist of some percentage of the revenues created by the drug in question.