When combining two complete sentences with a conjunction ("and," "but," "or," "for," or "yet"), precede the conjunction with a comma. Example: Still, the sun is slowly getting brighter and hotter, and ...

Jacoby commented, "Elon Musk is the Nick Nolte of Joseph Goebbels." "The same guy running around the stage with a chainsaw and unable to complete a sentence wants to put his microchips in people’s ...