Remove "its" and "their" from a sentences

Is there any way to remove "their" in following sentences which I've wrote.

"It is evident that pupils leave their training centers due to personal reasons and extra-curricular activities."

"In other words, they consider it to be an inversion of their privacy."

"Another reason to support this argument is that every infants certainly not experience comfort in some unique clothes that particularly designed for their education academy."

I know how to remove "its" by using "therein" and "thereof" similar to following.

"Majority of the school around the world have been imposing uniform rules on children therein since prehistoric times."

"Therefore, inhabitants do not need to exert excessive amount of money on clothing and brands thereof."

Please note that all of the above sentences are written by me. Therefore, it is possible to have some grammatical issues and inappropriate usage of vocabulary.