Complex sentence: Rihanna was signed to Rogers'and Sturken's production company, Syndicated Rhythm Productions, who assigned her a lawyer and manager before the completed demo tape was distributed to various record labels around the world in 2004.
Split into simpler sentences: Rihanna was signed to Rogers'and Sturken's production company, Syndicated Rhythm Productions, who assigned her a lawyer and manager. A demo tape was distributed to record labels around the world in 2004.