Original sentence: The Forerunner 60 (an evolution of the Forerunner 50), the Forerunner 405CX (405 chassis) and the Forerunner 310XT (305 chassis)
Edited sentence: The Forerunner 60 (an evolution of the Forerunner 50), the Forerunner 405CX (405 chassis) and the Forerunner 310XT (an evolution of the 305 chassis)