so to answer your original question, while rookie is driving, you the senior are to be on line 4 sitting in the passenger seat beside him. if the rookie is on line 4, at a shipper or receiver, you the senior driver can be on line 2 getting your rest, so that you can roll as soon as your 10 hour brake is over. he, the rookie, can take his 10 hour brake while you drive your 11, then he can drive his 11 while you again go to line 4 and sit in the passenger seat beside him again.
no wonder so many get caught when they try to cheat on a log book, you must know how it is supposed to work, before you ever consider cheating.
lets say that for example you have a delivery, and a pick up in close proximity. and the rookie drives into the delivery, the senior driver goes to bed while the rookie take 8 hours to get unloaded, then the rookie needs to drive over to the shipper, 30 min. so the senior driver gets up, line 4 to the passenger seat, while the rookie drives to the shipper, senior goes back to bed for 2 hours, then the trailer is loaded, and it is time to roll. now the senior driver has just split logged a 10 hour brake in the sleeper, and can drive 11 hours, because the 2 hours and 30 min after his 8 hour brake ended still leave 11 hours and 30 min of available work time on his 14. so the rookie then goes to bed, after all that unloading and loading, and sleeps while senior drives his 11, then the senior moves to line 4, and lets the rookie drive his 11, then they both go back down for 10.
see it isn't complicated at all, once you read and understand the regs.