Complex sentence: Elliot Handler (April 9,1916--July 21,2011) was the co-founder of Mattel and with his wife a developer of the biggest-selling toys in American history, including Barbie dolls, Chatty Cathy, Creepy Crawlers and Hot Wheels.
Split into simpler sentences: Elliot Handler (April 9,1916--July 21,2011) was the co-founder of Mattel. With his wife, he was a developer of some of the biggest-selling toys in American history, including Barbie dolls, Chatty Cathy, Creepy Crawlers and Hot Wheels.