Complex sentence: Hartley signed for Dundee as manager on 5 February 2014 replacing John'Bomber' Brown and lead the Dee to the Scottish Championship title on the final day and promotion to the Scottish Premiership for the 2014-15 season.
Split into simpler sentences: Hartley signed for Dundee as manager on 5 February 2014 replacing John Brown. He lead the Dee to the Scottish Championship title on the final day and promotion to the Scottish Premiership for the 2014-15 season.