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Perhaps my last opponent was still using the old codex (?) But I have the new daemon book now and I don't find anything about splitting your force in half for deep strike purposes... and further I cannot find where it says daemons can move and/or assault after deep strike... can someone point me to the right page, paragraph?

You don't. Daemons can now be deployed like any other army but every unit has deepstrike I believe.

And they definitely can't assault after Deep strike. The only real weird things you can do is use Instruments to deep strike 2 units at a time.