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So last night I was playing my Necrons against a friend's Ultra Marines. At one point in the game, he had a unit of vanguard with a chaplain multi-assault my two units of Destroyers. Through sheer bad luck on his side, he lost so many models during the combat that the chaplain was on his own against one unit, and the surviving vanguard were against the other. The chaplain was no longer in unit coherency with the vanguard. Now during that round of combat, I know it's still treated as one giant combat. Here is where my question is: During all combats after that, is it still one combat, or two?

An IC can only choose to leave a unit during the movement phase, and cannot choose to leave a unit when it is locked in combat - so he is stuck with the Vanguard until:
a) The Vanguard are all dead, or
b) The combat finishes, and his movement phase come around.

Therefore, it remains a single combat.

So even though coherency was lost he still remains part of the unit until combat ends? Interesting. Thank you for the response.

Yes, same way as a normal unit losing coherency doesnt mean they split.

Makes sense. It was the whole independent character part of it that had me confused. Had we continued, that would have worked out better for me then, since my Lychguard with a Destroyer Lord were going to charge in next turn to mop up.