I know I can say:
We should not include any complex idea in our presentation.
Can I say:
1) We should not include any complex things in our presentation.
2) We should not include something complex in our presentation.
I just want to know whether the 2 sentences above is acceptable in English or not.
Let's say you wanted to present an organisation hierarchy, with the General Manager at the top, right down to the clerical staff. This would be a "complex thing" to present, but a simple idea for most people.
It's possible to think of other complex things that you might present that aren't ideas.