The example sentence makes a comma splice error, since both clauses are independent and they are joined only by a comma. Comma splice errors can be fixed by making the clauses into their own sentences, or joining them into a compound sentence with either a semicolon or a comma and an appropriate coordinating conjunction. All three options are equally grammatically correct, whichever you choose depends on your own personal writing style.

A comma splice error occurs when two independent clauses are joined by only a single comma. One option is to simply make the two independent clauses into separate sentences. If you wish to join two independent clauses into a compound sentence, you may either use a comma followed by an appropriate coordinating conjunction or you may use a semicolon with no accompanying conjunction. In the sentence above, the second independent clause makes a contradictory statement, so adding the coordinating conjunction "but" is the best way to fix the splice.

A comma splice error occurs when two independent clauses are joined by only a single comma. One option is to make the two independent clauses their own sentences. The other is to join them into one compound sentence, if you choose to go that route, you can either join the clauses with a semicolon instead of a comma, or a comma followed by an appropriate coordinating conjunction. In this case, since a contrast is being indicated, the coordinating conjunction "but" is the best choice.

In the example sentence, both "my father is an excellent attorney" and "he has represented a broad array of clients" are both acting as independent (main) clauses, and thus joining them with only a comma is incorrect. This species of error is called a comma splice. If you wish to join two independent clauses into one compound sentence, you can either use a semicolon, or a comma and a coordinating conjunction. The only correct answer option uses a semicolon.

Note also, that semicolons, when used in this manner, cannot be followed by a coordinating conjunction.

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, something more than a comma is needed to separate the two clauses, and the only correct answer option provided adds the coordinating conjunction "and" after the comma.

This question asks you to correct a comma splice error. A comma splice occurs when two complete sentences are joined with just a comma. We have two options to correct a comma splice. We can either replace the comma with a period to create two complete sentences, or we can use a comma and a conjunction. In this context, the second sentence provides a contrast to the first sentence, so it is appropriate to use a comma and the conjunction “but.” Eliminating the comma creates a run-on sentence even if the conjunction "but" is added. The use of the conjunction "and" is grammatically correct, but it is not as strong a choice since it does not communicate the contrast between the two sentences. 

The list that forms the subject of the sentence, "Angles, Jutes, and Saxons," appropriately separates its items with commas. The comma between "Saxons" and "were" splits the subject of the sentence from the verb, and should be removed. This makes "Angles, Jutes, and Saxons were" the correct answer choice.

The list of names that forms the subject of the sentence is written incorrectly. All lists need to have commas separating their parts from each other for purposes of clarity. The correct answer choice is "Jane, Sally, and Suzy all went to the zoo together."

The list of names that make up the subjects of the sentence all need to be appropriately punctuated. Any such list needs have all the elements set apart from each other; therefore, "Tom, Dick, and Harry have all seen" is the correct answer.

The list that functions as the subject of the sentence needs to have commas separating its elements, distinguishing the different parts. The only answer choice that does this is "Politicians, organizers, and reformers all came together," making it the correct answer choice.