These may not be the ones that you are used to writing in formal reports. There's an interesting little bit of history here. Another good reason for not using the wider reaches of your vocabulary on panels is that simple, familiar words are much easier for visitors whose first language is not English, or who have some difficulty with reading. Simple sentences also help. Compare and contrast the last two sentences to see what I mean.
Sentences can be simple without being short.
It helps if you vary your sentence length to avoid the staccato style, reminiscent of early schoolbooks, which can feel patronising. The occasional very short sentence can have a lot of impact. I had added humour to the list but there just wasn't room for it. Editing text for panels can involve some painful cuts. Susan Cross would be a struggling poet if she wasn't a successful interpreter and scriptwriter.