I would say it is too wordy. Try breaking it into 2 sentences or combining them better.
Jarvis likes jazz and often attends jazz concerts.
The cartoonist is looking to reform the school system, if you look closely to the picture there is a public school outside of the "loop" and the private school is in the loop
When could is used it refers to an ability that <span>a person generally had in the past or to something that was generally possible in the past, can is present.
I could wash the dishes for you. (having the ability to do it)
I can wash the dishes for you. (its actually going to be done)
hope this helps you! :-)</span>