ok here it is.
the original sentence is a faithful and accurate summary of the relevant law. warts (some of which some of you rightly spot) and all. it is also, I agree, a pretty awful sentence. The key question I was interested in is whether it means anything to lay readers.
a civilian object is a school, the number 73 bus, your house and mine. I had thought that most people would get this.
"military objective" is the unfortunate phraseology of the law and I totally agree with you www that it sounds like it should refer to "bomb Slough". In fact it doesn;t - it means soldiers and miltary camps. I have no idea why the law uses "objective" and not "objects". It's so taken for granted that it does mean objects, and is threfore comparable to the civilian side of the equation that the (mis)use of this horrible word in teh law itself is never really even discussed. But we all go on repeating it because it is what the law says.
Coolmama- sorry - I hadn;t seen that you came up with what is imo the next best option - using targets instead of objectives.
Ellbell is right that you can't have a civilian target (or objective)
Coolmama - tamum is right - they don;t need to distinguish between civilians and civilian objects - they can happily be lumped together.
welliemum - you are right that it needs to explain what, having made such a distinction they're meant to do, but that comes in a later sentence.
and finally, some of you have correctly identified that the law doesn't prevent combantants from causing harm to civilians. it prevents civilians being targeted and it prevents "disproportionate" or "excessive" harm. hence the concept of collateral damage.
the key point is that combatants have to distinguish between military people and things, on the one hand, and civilian people and things, on the other. and they are only allowed to direct their actions against the former. this does not mean that all killing of civilians will be unlawful. Unfortunately the law is couched in confusing terms. "Miltary objectives" is used to encompass both people and things; whereas on eth civilian side the law refers to "civilians" and "civilian objects"
it was very useful to hear people's reactions. I had a difference of opinion with a colleague about Jo Public/the lay reader and you will be delighted to know that I thought that "military objective" was as understandable as "military target" but you have proved me wrong as well as picking all manner of other holes in the sentence. genuinley genuinely useful