Ritual summons with more than one effect

[Panpiper]

I fully expect that this has been discussed before but I could not find it with searching. I apologize for filling up the board with redundancies.

I am trying to make summoning spells that summon more than a single type of unit. For instance I want to make a Nurgle summoning that summons ten Plaguebearers and thirty Nurglings, or another example would be a Bloodletter Champion plus twenty Bloodletters and twenty Flesh Hounds. However both reading the mod guide and trying experiments, I am unable to come up with a ritual spell that summons more than a single unit type (getting lots of that type is not an issue).

Would anyone be willing to step me through the command structure?