This sentence features a common error of punctuation known as a comma splice. Both clauses, separated here by a comma, are independent. Independent clauses can be separated by a semicolon, a period, or a comma with a conjunction after it. Any of those three options would fix the comma splice error in this sentence, and all three options are equally grammatically correct in this instance.

This is an example of comma splice. The two clauses (separated here by a comma) are both independent clauses (each is a grammatically complete clause that could stand alone as a full sentence). If they are linked with a comma and no conjunction, as in this example, it is a comma splice. They should be linked with a comma and a conjunction, a period, or a semicolon.

There are several acceptable ways to separate independent clauses, but simply using a single comma by itself is not one of them. To do so is to make an error known as the comma splice. The sentence above contains such a splice, and it should be corrected. The options to make this correction would be to add a coordinating conjunction after the comma, replace the comma with a period, or replace the comma with a semicolon.

There are several acceptable ways to separate independent clauses, but simply using a single comma by itself is not one of them. To do so creates an error known as the comma splice. The sentence above features a comma splice after "hands." The first clause, "the brilliant surgeon had steady hands," is a grammatically complete independent clause, as is the second clause, "she was an incredible pool player." The options for separating these two clauses are to place a period, a semicolon, or a coordinating conjunction and a comma between them. All three of these options are equally grammatically correct, whichever you choose is a matter of style.

There are several acceptable ways to separate independent clauses, but simply using a single comma by itself is not one of them. That is an error known as the comma splice. The three options available to correct such an error are a period, a conjunction with a comma, or a semicolon. These three options are all equally grammatically correct, which one you choose is a matter of style. The example sentence contains two independent clauses, so rather than a comma after "world" one of those three options needs to be inserted.

Both clauses in the example sentence are independent clauses (grammatically complete clauses that could stand on their own as sentences). When two independent clauses are connected into one sentence it is called a compound sentence. The correct ways to punctuate compound sentences are either a conjunction and a comma or a semicolon. The other option in this instance would be to simply replace the comma with a period.

There are several acceptable ways to separate independent clauses, but simply using a single comma by itself is not one of them. To do so creates an error known as the comma splice. The example sentence, by using a comma instead of a period, coordinating conjunction and a comma, or a semicolon, contains such an error.

This is an example of a comma splice. The two clauses here are both independent clauses, meaning each could stand on its own as a full sentence. Commas cannot be used to separate such clauses. A semicolon would be appropriate here. Another alternative would be to add a conjunction after the comma, such as "...attacked by piranhas, so he decided..."

The error in this sentence is that two independent clauses ("Laura wanted to attend her high school's ten-year reunion" and "it was only the possibility of seeing her ex-boyfriend that made her hesitate") are being joined by a comma, which is an incorrect use of a comma. Since independent clauses could be seperate sentences, there needs to be a stronger form of punctuation than a comma to join them, such a semicolon, a period, or a coordinating conjunction followed by a comma. 

When two independent clauses are joined only by a single comma, this results in an error known as a "comma splice." In the example above, the two independent clauses could be correctly connected by a semicolon or a comma followed by a conjunction (e.g. "and" or "but"). In addition, the two independent clauses could be made into distinct sentences.