Well, last time I checked Apprentice divers should know what to do when markers start pointing in directions other than which they came, and should have all the training necessary to make multiple jumps.
complex - made up of complicated parts.
What is complicated about making a jump after you have been trained to do so? An added "variable?" Really? When you are trained to make jumps you are taught to eliminate those variables, or at least I was.
Tie in, make sure the exit side is clearly marked, tell your buddy to hold, tie into the line you are jumping to, and clip the reel back onto the jump line; if the line you jumped to has arrows pointing away from your jump you put a cookie on the exit side. As long as you can identify your reels, cookies, and arrows in the dark (variables eliminated), which I was taught in my basic class, the only variable left is the line breaking somewhere, which is common to any cave dive, and at worst that is a simple lost line drill which any apprentice diver should be able to do. Yes, the more lines you have the more that can break, but the chances of more than one line breaking is rather slim.
Like I said earlier, an apprentice diver has all the training necessary to do multiple jumps, weather or not that diver is comfortable with doing so is a different story.