Complex sentence: His brother, Sean Ryan, is currently CEO of Meez, a website that allows users to create their own 3D avatars, and was previously CEO of Listen.com, which was acquired by RealNetworks in 2003.
Split into simpler sentences: His brother, Sean Ryan, is currently CEO of Meez, a website that allows users to create their own 3D avatars. He previously served as CEO of Listen.com, which was acquired by RealNetworks in 2003.