1. A method or manner of doing something that is complicated, intricate, or difficult to understand
He explained the theory in a complex way that few could understand.
Ele explicou a teoria de uma maneira complexa que poucos conseguiam entender.
2. A convoluted or roundabout approach to solving a problem or achieving a goal
She chose a complex way to solve the problem instead of taking the simple route.
Ela escolheu uma maneira complexa de resolver o problema em vez de tomar o caminho simples.