Independent clauses must be separated by proper punctuation,
either through the use of a period, semi-colon, or, sometimes,
a colon. Commas can be used to separate independent clauses
only if they are used with a coordinating conjunction. Comma
splices and fused sentences are different errors, but they
produce the same grammatical problem of juxtaposing two independent
clauses without proper punctuation between them.
A fused sentence, or a run-on sentence, occurs when two complete
sentences are not separated by any punctuation.
Incorrect: Arco, Inc. failed to meet profit
expectations last year its stock price fell dramatically. Correct: Arco, Inc. failed to meet profit
expectations last year. Its stock price fell dramatically.