Inexperienced pilots ? Both co-pilots had more hours than a lot of low cost carrier captains.. The pnf more than a lot of not so low cost captains. Methinks quite an experienced crew over all. As for rest periods you have to take them at some point. Who knows what reasons the capt took that break, maybe the lesser demanding part & he trusted his crew.
At least unlike some airlines where the co pilots only have 150-200 hrs which apparently is fine if they have appropriate training.