Complex sentence: All design, implementation, and manufacturing have been carried out by students with two exceptions: manufacturing of mechanical structure (carried out by department workshop in alu7075) and the raw non-mounted PCBs.
Split into simpler sentences: All design, implementation, and manufacturing have been carried out by students. Only two exceptions were made: manufacturing of mechanical structure (carried out by department workshop in alu7075) and the raw non-mounted PCBs.