Complex sentence: When Allen read Robert Daley's book, Prince of the City, she was convinced it was a Sidney Lumet project, but the film rights had already been sold to Orion Pictures for Brian DePalma and David Rabe.
Split into simpler sentences: When Allen read Robert Daley's book, Prince of the City, she was convinced it was a Sidney Lumet project. But the film rights had already been sold to Orion Pictures for Brian DePalma and David Rabe.