How to return multiple values from an array in a single cell?

Hi All,

I am building a marketing dashboard that shows the effectiveness of two campaigns based on where the campaign has been deployed (website, email, facebook, twitter, google+ etc.). In each campaign I have a checklist (using developer ribbon) with these different dimensions.

I want a formula that checks the checklist, identifies all the boxes that are unticked and returns them in a single cell. The cell would read:

To increase traffic to the Shampoo campaign (Campaign A), expose it to Google+ and Facebook as these channels generated 578 and 2009 visitors respectively for the Makeup campaign (Campaign B).

I already have it working for returning a single value with the following formula but need it to return multiple values.

=IFERROR("To increase traffic to the "&B4&" campaign, expose it to "&INDEX(L4:L10,MATCH(K5,M4:M10,FALSE))&" "&"as"&" "&"this channel generated "&VLOOKUP(INDEX(L4:L10,MATCH(K5,M4:M10,FALSE)),L26:N31,2,FALSE)&" visitors for the "&D4&" campaign","")

This seems pretty tough to do but am sure someone on here can crack it!

Thanks

FK