I'm a little confused... there shouldn't be a comma here. If anything, there should be a semicolon --> "...called Sam; it sat on the mat" because there are two phrases that could stand independently as sentences. This doesn't happen if there's just a comma there, unless there's a conjunction along with it (and, but, or, nor, etc.).
So I guess the technical term is a semicolon? Though that doesn't seem so technical...
Correct usage of a comma: The cat, called Sam, sat on a mat.
Or: The cat, who sat on a mat, was called Sam.
Or: Sam, a cat, sat on a mat.
Or: The cat, who was called by the marjority of unsaid persons as Sam, sat on the mat.
Or: Upon the mat sat a cat... No, forget that last one.
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