Complex sentence: Architectural Engineers' roles can overlap with that of the architect and other project engineers; like architects, they seek to achieve optimal designs within the overall constraints, except that instead of focusing primarily on style and aesthetics, the Arch.E. uses the tools of engineering.
Split into simpler sentences: Architectural engineers' roles can overlap with that of the architect and other project engineers. Like architects, they seek to achieve optimal designs within the overall constraints, except using primarily the tools of engineering.