This is fairly simple, but for the best analysis you should also separate out independent clauses. If you don’t do this you risk "blending" different elements, making analysis difficult. For example, in the above argument, there are four sentences. If you only letter the sentences, you get the following results:

 

1. The myth that video games cause violent behavior is undermined by scientific research and common sense.

 

 

2. According to FBI statistics, youth violence has declined in recent years as computer and video game popularity soared.

 

 

3. We do not claim that the increased popularity of games caused the decline, but the evidence makes a mockery of the suggestion that video games cause violent behavior.

 

 

4. Indeed, as the U.S. Ninth Circuit Court of Appeals declared: "The state has not produced substantial evidence that…violent video games cause psychological or neurological harm to minors."

 

Sentence c has two independent clauses. Take the extra step and treat them as separate sentences, it will simplify things in the long run. To keep track of the original structure, use numbered sub-points. For example:

 

1. The myth that video games cause violent behavior is undermined by scientific research and common sense.

 

 

2. According to FBI statistics, youth violence has declined in recent years as computer and video game popularity soared.

 

 

 

 

1. We do not claim that the increased popularity of games caused the decline.

 

 

2. But the evidence makes a mockery of the suggestion that video games cause violent behavior.

 

Indeed, as the U.S. Ninth Circuit Court of Appeals declared: "The state has not produced substantial evidence that…violent video games cause psychological or neurological harm to minors."