Complex sentence: It was executive produced by Kirkman, David Alpert, Scott M. Gimple, Greg Nicotero, Tom Luse, and Gale Anne Hurd, with Gimple assuming the role of showrunner after Glen Mazzara's departure from the series.
Split into simpler sentences: It was executive produced by Kirkman, David Alpert, Scott M. Gimple, Greg Nicotero, Tom Luse, and Gale Anne Hurd. Gimple assumed the role of showrunner after Glen Mazzara's departure from the series.