Complex sentence: This was the first time that the court decided on the conditions in which Israeli security personnel are required to disobey illegal orders when the orders were "manifestly" illegal, and these "must" be disobeyed.
Split into simpler sentences: This was the first time that the court decided on the conditions in which Israeli security personnel are required to disobey illegal orders. On the other hand, some orders were "manifestly" illegal, and these "must" be disobeyed.