Complex sentence: Casting announcements began in February 2011, with Robert Taylor first cast in the lead role of Walt Longmire, the sheriff of Absaroka County, Wyoming, who was Widowed a year prior, however he buries his pain behind his brave face and dry wit.
Split into simpler sentences: Casting announcements began in February 2011, with Robert Taylor first cast in the lead role of Walt Longmire, the sheriff of Absaroka County, Wyoming. Recently widowed, Longmire buries his pain behind his brave face and dry wit.