1. A difficult or intricate task or assignment that involves multiple interconnected components, challenges, or requirements
The space agency undertook a complex mission to Mars with multiple objectives.
A agência espacial empreendeu uma missão complexa para Marte com múltiplos objetivos.
2. An operation or project requiring sophisticated planning, coordination, and specialized expertise
Negotiating the peace treaty proved to be a complex mission for the diplomats.
Negociar o tratado de paz provou ser uma missão complexa para os diplomatas.