I have extracted those two sentences in different journals below.There is a coma before the and in the first sentence whereas the second sentence there is no comma. Is the writer correct? I think there shouldn't be a comma in the first sentence because the writer used a surbodinating conjunction after the coordinating conjunction. The second sentence is Ok. Please correct me if I am wrong?
This autistic dance group has made history at the European championships, and now they want to change the way we all see young people with autism.
Are you suggesting that "now" is a conjunction in those sentences? I don't agree that it is. In any case, these sentences are acceptable to me with or without a comma.
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Are you suggesting that "now" is a conjunction in those sentences? I don't agree that it is. In any case, these sentences are acceptable to me with or without a comma. I would say it is the author's choice. Personally I would probably include the comma.
The rule is that independent clauses are separated by a comma before the coordinating conjunction (and, but, or, etc.).
Thus, the first example is correct, and the second example should be
Jaki Whyte's story was first told in The Guardian, and now she's ...
CJ