Was heißt »Komplex« auf Englisch?

Das Substantiv »Komplex« lässt sich wie folgt von Deutsch auf Englisch übersetzen:

Englische Beispielsätze

Human relationships are very complex.
Human relationships are complex.
This example is a little more complex.
Arabic isn't complex.
This is a very complex issue.
Mozart wrote brilliant, complex musical compositions as easily as you or I would write a letter.
Tom is very complex.
The brain is the most complex organ in the body.
The brain has a complex structure.
Origami can seem deceptively simple, hiding complex math within its creases.
That's a complex question.
The Fuggerei in Augsburg is the world's oldest social housing complex still in use.
Mary fluctuates between having an exaggerated sense of her own importance and an inferiority complex.
Sami drove to his apartment complex.
The use of "oh" in English is quite complex.
Sami got to his apartment complex.
He has an inferiority complex, doesn't he?
An inferiority complex and a superiority complex often lead to the same behavior.
Tom is complex.
It's the translations which seem to be the simplest that are often the most complex.