Add punctuation: For the next three years he travelled frequently between England and the United States before accepting a temporary post at the University of Notre Dame in 1952
A: For the next three years he travelled frequently between England and the United States before accepting a temporary post at the University of Notre Dame in 1952.

Add punctuation: There are changing rooms showers and a limited amount of lockers for your towel and clothes remember to bring a little padlock yourself
A: There are changing rooms, showers and a limited amount of lockers for your towel and clothes remember to bring a little padlock yourself.

Add punctuation: There was however more crucial issues to be decided ie the control of the Communist Party and the Red Army
A:
There was however more crucial issues to be decided; i.e., the control of the Communist Party and the Red Army.