The diagram illustrates the 'complexity' of the cell's structure.
He doesn't grasp/understand the 'complexity' of the situation.
Her poetry is too 'complex' [='complicated'] for my taste.
(..) actually want to be me. And somebody loves me, and I love him. Pearl, why don't you get us that baloney cake out the icebox? Your mama's a complex woman. I'm going to bed. Good night, darlin'. Kate: But you know nothing about her. Are you even sure who she is? (..)2002 Sweet Home Alabama
(..) - You're telling me this is personal? - He's not doing it by himself. - Someone else is footing the bill. - Who? Heard of the military-industrial complex? Those are the manufacturers of the weapons. They think they own the system and they will do anything to keep that power. (..)2013 White House Down
(..) I'll show you the way. We got some important people waiting for us. - Are you okay, sir? - I'm all right. - Is your family in the complex? - They won't be here till tonight. - Your daughter, where's your daughter? - I couldn't find her. I hope she got out. Do you know these men? (..)2013 White House Down