Records say that managers who were earlier sacked by their club ,and tried to work well with their club for the second time have all been sacked . So Jose Mourinho was not the first one to experience the second sack from his club.
1) Jose Mourinho. 2004/2007. and the second time he was sacked was 2015. With Chelsea.
2) Kenny Dalglish 2001/20012. With Liverpool.
3) Kevin Keegan. 1992/1997. 2008. With Newcastle United.