Detecting camps like this is difficult and it's very rarely done well. I've never attempted it myself, so I don't know the best way.
However, it seems to me that the answer is a "player's group detects enemy" trigger exactly over the camp itself. For it to fire, the enemy in the camp must be detected so therefore the camp must have been spotted.
A trigger "east detected by west" will fire even if the west units are outside the trigger area.
Since you sometimes get wierd detections that you don't really deserve, then perhaps you should also have a player present trigger. Or several small overlapping triggers to get the right shape, since the area from which the camp may be seen is unlikely to be oval or rectangular.
And yes, I agree with bedges. A few sentences and paragraphs would make your posts much easier to understand. I confess I've given up once or twice in the forest of subordinate clauses.