>sounds rather restrictive and specific, to be honest.
Write a single sentence which clearly and concisely includes exposition, thought, aside, rhetorical question, self rebuttal and conclusion without following the "standard" I included in my edit. This is what allows writers like James, Joyce, Gass, Gaddis, Wallace, Pynchon, etc to write their wonderfully long and complex sentences and by complex I am referring too meaning as much as structure, we can have great meaning with simple structures but we have to accept a certain amount of ambiguity with that. Sure that challenge can be executed as a paragraph but then it ceases being a single thought, it is a collection of thoughts and that is a very different thing.