Sentence Correction (SC) | Re: As the result of a medical experiment

Hi, Kindly help me in clearing th doubt
In D meaning is clear, but there is no subject after, but...........
we have 1 independent clause on one side- Alex DeLarge, the main character of A Clockwork Orange, no longer desired to behave violently, but was unable.......
I know that since the subject is same, so the repetition of he (Alex DeLarge) is not required. But without the comma this sentence stands fine as -Alex DeLarge, the main character of A Clockwork