Indeed, basically Manchester City's performance this season has declined greatly apart from some of their main players who are injured, but I think Real Madrid has a much stronger overall strength so there is no surprise for Real Madrid's victory in this second leg and in terms of team play, Manchester City is also not that good, they can't get out of the pressure given by Real Madrid..
Actually Real Madrid's game was also not as good as the previous season because they lost a number of important players in the defense sector but because of Ancelloti's experience they managed to beat Man City in their last two matches. This is also inseparable from Man City's own performance which has declined so much this season that they had to accept failure more quickly in the Champions League for this season.
The struggle is still quite long and Real Madrid is required to play much more effectively if they want to advance to the final and of course that will be a challenge for Ancelloti because usually when Real Madrid has entered the semifinals, there is great hope that they will emerge as champion candidates.