It is common to insert a comma (or other punctuation) before the coordination in conjoined clauses, but it is less common to insert a comma before the coordinator in conjoined predicates:
Hence,
> Peter ate the fruit and drank the beer. [1]
has no comma, whereas in
> Peter ate the fruit, and Peter/he drank the beer. [2]
the comma is inserted
The commas in
> I send you my very best wishes, and look forward to our next meeting. [3]
> Margaret is ill, but will soon recover. [4]
are op…