Clarification ?

[golfdesigner]

I got the new Redding NFHS 2007 Football Rules Study Guide, I like it and find it very useful, however, this time, please help me with this:

Under the Chapter 2 Recent Rules Changes
End Zone Penalty Enforcement
"Basic spots for enforcement of penalties were clarified. The basic spot is the 20-yard line for fouls by the opponent of the team in possession a the time of the foul when when the opponent is responsible for forcing the ball across the goal line of the team in possession, and the run ends in the end zone adn is followed by a loose ball, regardless of where the loose ball becomes dead. (10-4-6)"

Can somebody help me figure out how this is a clarification, and 'splain it to me in simpler terms?

I've read this a number of times and it isn't getting a whole lot clearer.