Complex sentence: Charles Gérald Genta (1931-2011) was a Swiss wristwatch designer, noted for designing his own eponymous brand as well as his design work with other firms, including IWC, Universal Genève, Patek Philippe and Audemars Piguet, among others.
Split into simpler sentences: Charles Gérald Genta (1931-2011) was a Swiss wristwatch designer. In addition designing his own brand, marketed as Gérald Genta' time pieces, Genta contributed to the designs of other firms including IWC, Universal Genève, Patek Philippe and Audemars Piguet, among others.