what is a complex hybrid

Hello,
Could anybody please tell me - when hybrid becomes complex?
As I understood cross between two species is a primary hybrid, for example:
hangianum x vietnamense = Paph. Annie Fuchs
Is anything that not primary - complex or is it more complicated then that? What are other hybrid types?
Also what type of hybrid would be between a specie and hybrid, for example:
Paph. Carolyn Butcher (delenatii x Fanaticum)

Thanks a lot.

[Ray]

I don't know that there is a hard-and-fast break point between simple and "complex" hybrids, but the latter typically have several generations of breeding between them and the species in their backgrounds. (Incidentally, "species" is both singular and plural.)

I don't know that there is a particular classification for "Carolyn", although I've heard people use the term "near primary" since Paph. Fanaticum is one.

Thanks a lot.