Well I would have referred to either JAR-1 or EASA-definitions, but neither document contains the word "complex".
And neither is relevant to Part-FCL (the subject of the original question)
LASORS did seem to me a sensible document to refer a (probably) UK based CRI trying to work out what he's able to do, given the absense of anything else particularly coherent.
Were the original question about the
JAA requirements for CRI/CRE, that might have been relevant, unfortunately it was not.
Time to wake up, guys, the EU Regulation is law in 3 weeks and 3 days.