Complex sentence: Johnson retired from the VFL at the end of 2011 to focus on his full-time job at the AFL Players Association; he also took on the senior playing-coaching role at the Montrose Football Club in the Eastern Football League.
Split into simpler sentences: Johnson retired from the VFL at the end of 2011 to focus on his full-time job at the AFL Players Association. He took on the senior playing-coaching role at the Montrose Football Club in the Eastern Football League.