There is a lot of literature referenced in the write up that I'm sure would provide a more in depth understanding but I think it does a good job of providing a gist of things and also some of the historical context of the Tibet-China relationship. Another commenter pinguinu has also pointed out that the liberation of Tibet was a gradual process with many challenges, which I think is important to consider. This quote (which I got from the sino article) outlines both that and also the framework with which the CPC has approached these types of challenges well I think:

“As yet, we don’t have a material base for fully implementing the Agreement, nor do we have a base for this purpose in terms of support among the masses or in the upper stratum. To force its implementation will do more harm than good. Since they are unwilling to put the agreement into effect, well then we can leave it for the time being and wait. …” [Mao Tse-Tung, from Selected Works of Mao Tse-Tung, Volume 5]