How to use "complex" in a sentence

During the twelve years of their marriage, Tina had become a different and more complex person than she'd been on their wedding day, but Michael hadn't changed at all - and didn't like the woman that she had become

The choreography was complex, and the two lead singers had strong, clear voices.

That would have been a complex operation, fraught with the peril of discovery

Deep inside the secret Sierra complex, three stories below ground level, this room measured forty feet by twenty

"I expected an enormous structure, a gigantic complex."

This level was the same size as the one on which they entered the complex: more than four hundred feet on one side, and more than one hundred feet on the other

He walked out of the lab, went to his quarters, dressed in outdoor clothes, and left the complex