The sentences should be complex, with the use of subordinate clauses and writing adapted to "suit audience and purpose".

BBC: What do Sats test levels mean?

Deciphering the Pope's often dense theological language, analysing his long sentences replete with subordinate clauses, makes the selection of pithy soundbites a real challenge to Vatican radio and TV reporters.

BBC: Decoding the Papacy: Benedict XVI's cryptic frustration