Complex sentence: British Aerospace (BAe) was a UK aircraft, munitions and defence-systems manufacturer that purchased Marconi Electronic Systems, the defence electronics and naval shipbuilding subsidiary of the General Electric Company plc in 1999 to form BAE Systems.
Split into simpler sentences: British Aerospace (BAe) was a UK aircraft, munitions and defence-systems manufacturer. In 1999 it purchased Marconi Electronic Systems, the defence electronics and naval shipbuilding subsidiary of the General Electric Company plc to form BAE Systems.