IELTS Vocabulary: trying to be 'difficult'

 I recently read a student's essay that contained the following sentences:

1. As a matter of fact, it is no clandestine issue to anybody that sport has indisputable impacts on overall health of people.
2. The proponents of this view perceive that investment in enhancing the number of health-related facilities is not alone a cure-all for protecting and maintaining healthy atmosphere.
3. To revolutionize public health, alternative effective measures are entailed.

I told the student that I thought she was trying too hard to be 'difficult'. Which words or phrases in each sentence do you think I suggested changing?