Complex sentence: In January 2012, RMU announced that Walton would retire at the end of the 2013 season, which would mark his 20th year as Robert Morris Head Coach and assistant head coach and former Steelers defensive lineman John Banaszak would replace Walton upon his retirement.
Split into simpler sentences: In January 2012, RMU announced that Walton would retire at the end of the 2013 season, which would mark his 20th year as Robert Morris Head Coach. Assistant head coach and former Steelers defensive lineman John Banaszak would replace Walton upon his retirement.