Is the exercise of "infrastructure simplification" for a Data centre, that is taking care of diverse user needs, from within the one, parent organisation ? In that case, perhaps, the sentence might be rephrased as follows :

But the reality is that there are multiple concurrent workloads coming from multiple lines of business and decision makers.

Hth.


--------------------------------------------------
Note added at 11 hrs 56 mins (2004-05-06 08:43:30 GMT)
--------------------------------------------------

Alternatively -
But the reality is that there are multiple concurrent workloads being demanded by multiple lines of business and decision makers.